macosx: Do not show horizontal scroller on audio grouping table view

Signed-off-by: Claudio Cambra <developer@claudiocambra.com>

modules/gui/macosx/UI/VLCLibraryWindow.xib

@@ -927,7 +927,7 @@
                 <splitView arrangesAllSubviews="NO" dividerStyle="thin" vertical="YES" translatesAutoresizingMaskIntoConstraints="NO" id="YHF-re-hif">
                     <rect key="frame" x="0.0" y="0.0" width="714" height="390"/>
                     <subviews>
-                        <scrollView fixedFrame="YES" borderType="none" autohidesScrollers="YES" horizontalLineScroll="24" horizontalPageScroll="10" verticalLineScroll="24" verticalPageScroll="10" usesPredominantAxisScrolling="NO" id="KW4-fp-jy1">
+                        <scrollView borderType="none" autohidesScrollers="YES" horizontalLineScroll="24" horizontalPageScroll="10" verticalLineScroll="24" verticalPageScroll="10" hasHorizontalScroller="NO" usesPredominantAxisScrolling="NO" horizontalScrollElasticity="none" translatesAutoresizingMaskIntoConstraints="NO" id="KW4-fp-jy1">
                             <rect key="frame" x="0.0" y="0.0" width="298" height="390"/>
                             <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                             <clipView key="contentView" id="4uw-9H-2bN">