macosx/library: re-order tabs to start with Video instead of Audio

This also fixes the indent on top and bottom for the collection view.

modules/gui/macosx/UI/VLCLibraryWindow.xib

@@ -54,7 +54,7 @@
                                                     <autoresizingMask key="autoresizingMask" widthSizable="YES"/>
                                                     <collectionViewFlowLayout key="collectionViewLayout" minimumInteritemSpacing="20" minimumLineSpacing="20" id="Rag-cM-k1g">
                                                         <size key="itemSize" width="256" height="214"/>
-                                                        <edgeInsets key="sectionInset" left="20" right="20" top="0.0" bottom="0.0"/>
+                                                        <edgeInsets key="sectionInset" left="20" right="20" top="20" bottom="20"/>
                                                     </collectionViewFlowLayout>
                                                     <color key="primaryBackgroundColor" name="controlBackgroundColor" catalog="System" colorSpace="catalog"/>
                                                     <color key="secondaryBackgroundColor" name="controlAlternatingRowColor" catalog="System" colorSpace="catalog"/>

modules/gui/macosx/library/VLCLibraryWindow.m

@@ -104,11 +104,12 @@ static const float f_playlist_row_height = 72.;
     _segmentedTitleControl.segmentCount = 4;
     [_segmentedTitleControl setTarget:self];
     [_segmentedTitleControl setAction:@selector(segmentedControlAction:)];
-    [_segmentedTitleControl setLabel:_NS("Music") forSegment:0];
-    [_segmentedTitleControl setLabel:_NS("Video") forSegment:1];
+    [_segmentedTitleControl setLabel:_NS("Video") forSegment:0];
+    [_segmentedTitleControl setLabel:_NS("Music") forSegment:1];
     [_segmentedTitleControl setLabel:_NS("Local Network") forSegment:2];
     [_segmentedTitleControl setLabel:_NS("Internet") forSegment:3];
     [_segmentedTitleControl sizeToFit];
+    [_segmentedTitleControl setSelectedSegment:0];
 
     _playlistDataSource = [[VLCPlaylistDataSource alloc] init];
     _playlistDataSource.playlistController = _playlistController;
@@ -239,14 +240,14 @@ static const float f_playlist_row_height = 72.;
 {
     switch (_segmentedTitleControl.selectedSegment) {
         case 0:
-            _libraryDataSource.libraryModel.libraryMode = VLCLibraryModeAudio;
+            _libraryDataSource.libraryModel.libraryMode = VLCLibraryModeVideo;
             _mediaSourceScrollView.hidden = YES;
             _libraryCollectionView.hidden = NO;
             [_libraryCollectionView reloadData];
             break;
 
         case 1:
-            _libraryDataSource.libraryModel.libraryMode = VLCLibraryModeVideo;
+            _libraryDataSource.libraryModel.libraryMode = VLCLibraryModeAudio;
             _mediaSourceScrollView.hidden = YES;
             _libraryCollectionView.hidden = NO;
             [_libraryCollectionView reloadData];