Set padding to debug activity

vlc-android/res/layout/debug_log.xml

@@ -2,11 +2,12 @@
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:orientation="vertical">
+    android:orientation="vertical"
+    android:padding="16dp">
 
     <LinearLayout
         android:layout_width="match_parent"
-        android:layout_height="wrap_content">
+        android:layout_height="wrap_content" >
 
         <Button
             android:id="@+id/start_log"

vlc-android/src/org/videolan/vlc/gui/preferences/PreferencesAdvanced.java

@@ -89,7 +89,7 @@ public class PreferencesAdvanced extends BasePreferenceFragment implements Share
                 startActivity(intent);
                 return true;
             case "clear_history":
-                new AlertDialog.Builder(getActivity())
+                new AlertDialog.Builder(requireContext())
                         .setTitle(R.string.clear_playback_history)
                         .setMessage(R.string.validation)
                         .setIcon(android.R.drawable.ic_dialog_alert)