fix cloud storage logo layout failure on iOS 6 and iPad (close #10080)

Resources/VLCCloudStorageTableViewController.xib

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="4514" systemVersion="13A603" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="5023" systemVersion="12F45" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none">
     <dependencies>
         <deployment version="1296" defaultVersion="1552" identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="3747"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="3733"/>
     </dependencies>
     <objects>
         <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="VLCCloudStorageTableViewController">
@@ -40,7 +40,7 @@
             <subviews>
                 <imageView userInteractionEnabled="NO" contentMode="scaleToFill" image="dropbox-white.png" id="9">
                     <rect key="frame" x="70" y="192" width="179" height="60"/>
-                    <autoresizingMask key="autoresizingMask"/>
+                    <autoresizingMask key="autoresizingMask" flexibleMinX="YES" flexibleMaxX="YES" flexibleMinY="YES" flexibleMaxY="YES"/>
                 </imageView>
                 <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" lineBreakMode="middleTruncation" id="20" customClass="VLCMenuButton">
                     <rect key="frame" x="120" y="387" width="81" height="39"/>
@@ -66,4 +66,4 @@
         <image name="dropbox-white.png" width="125" height="42"/>
         <image name="menuButton.png" width="63" height="39"/>
     </resources>
-</document>
\ No newline at end of file
+</document>

Sources/VLCDropboxTableViewController.m

@@ -76,8 +76,6 @@
     [_downloadingBarLabel setTitleTextAttributes:@{ UITextAttributeFont : [UIFont systemFontOfSize:11.] } forState:UIControlStateNormal];
 
     [self.cloudStorageLogo setImage:[UIImage imageNamed:@"dropbox-white.png"]];
-    [self.cloudStorageLogo sizeToFit];
-    self.cloudStorageLogo.center = self.view.center;
     [self.loginButton setTitle:NSLocalizedString(@"DROPBOX_LOGIN", @"") forState:UIControlStateNormal];
 
     [self.navigationController.toolbar setBackgroundImage:[UIImage imageNamed:@"sudHeaderBg"] forToolbarPosition:UIToolbarPositionAny barMetrics:UIBarMetricsDefault];
@@ -103,6 +101,9 @@
     aiFrame.origin.x = (tvSize.width - aiFrame.size.width) / 2.;
     aiFrame.origin.y = (tvSize.height - aiFrame.size.height) / 2.;
     _activityIndicator.frame = aiFrame;
+
+    [self.cloudStorageLogo sizeToFit];
+    self.cloudStorageLogo.center = self.view.center;
 }
 
 - (void)viewWillDisappear:(BOOL)animated

Sources/VLCGoogleDriveTableViewController.m

@@ -75,8 +75,6 @@
     [_downloadingBarLabel setTitleTextAttributes:@{ UITextAttributeFont : [UIFont systemFontOfSize:11.] } forState:UIControlStateNormal];
 
     [self.cloudStorageLogo setImage:[UIImage imageNamed:@"DriveWhite"]];
-    [self.cloudStorageLogo sizeToFit];
-    self.cloudStorageLogo.center = self.view.center;
 
     [self.loginButton setTitle:NSLocalizedString(@"DROPBOX_LOGIN", @"") forState:UIControlStateNormal];
 
@@ -137,6 +135,9 @@
     aiFrame.origin.x = (tvSize.width - aiFrame.size.width) / 2.;
     aiFrame.origin.y = (tvSize.height - aiFrame.size.height) / 2.;
     _activityIndicator.frame = aiFrame;
+
+    [self.cloudStorageLogo sizeToFit];
+    self.cloudStorageLogo.center = self.view.center;
 }
 
 - (void)viewWillDisappear:(BOOL)animated