library: fix thumbnail resizing mask on iOS 7 phones

Resources/VLCFuturePlaylistTableViewCell.xib

@@ -17,7 +17,7 @@
                 <subviews>
                     <imageView clipsSubviews="YES" userInteractionEnabled="NO" contentMode="scaleAspectFill" id="4">
                         <rect key="frame" x="0.0" y="0.0" width="320" height="89"/>
-                        <autoresizingMask key="autoresizingMask" widthSizable="YES" flexibleMinY="YES" flexibleMaxY="YES"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <color key="backgroundColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
                     </imageView>
                     <imageView userInteractionEnabled="NO" contentMode="scaleToFill" image="gradient-cell-ios7.png" id="22">