Change thumbnail's scale strategy

- Closes #1054

app/src/main/java/org/schabi/newpipe/fragments/detail/VideoDetailFragment.java

@@ -1007,9 +1007,6 @@ public class VideoDetailFragment
         int height = isPortrait
                 ? (int) (metrics.widthPixels / (16.0f / 9.0f))
                 : (int) (metrics.heightPixels / 2f);
-        thumbnailImageView.setScaleType(isPortrait
-                ? ImageView.ScaleType.CENTER_CROP
-                : ImageView.ScaleType.FIT_CENTER);
         thumbnailImageView.setLayoutParams(
                 new FrameLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, height));
         thumbnailImageView.setMinimumHeight(height);

app/src/main/res/layout/fragment_video_detail.xml

@@ -37,7 +37,7 @@
                     android:layout_height="wrap_content"
                     android:background="@android:color/transparent"
                     android:contentDescription="@string/detail_thumbnail_view_description"
-                    android:scaleType="centerCrop"
+                    android:scaleType="fitCenter"
                     tools:ignore="RtlHardcoded"
                     tools:layout_height="200dp"
                     tools:src="@drawable/dummy_thumbnail"/>