res:styles: Don't use a translucent navigation bar.

This causes view elements at the bottom to overlap with the navigation bar which makes it impossible to interact with said elements.

src/main/res/values-v19/styles.xml

@@ -6,7 +6,6 @@
         <item name="android:windowActionBarOverlay">true</item>
         <item name="android:windowFullscreen">true</item>
         <item name="android:windowTranslucentStatus">true</item>
-        <item name="android:windowTranslucentNavigation">true</item>
         <!-- Support library compatibility -->
         <item name="actionBarStyle">@style/Theme.ownCloud.Overlay.ActionBar</item>
         <item name="windowActionBarOverlay">true</item>