chore: remove unused variable

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

app/src/main/java/com/owncloud/android/ui/fragment/OCFileListFragment.java

@@ -206,7 +206,6 @@ public class OCFileListFragment extends ExtendedListFragment implements
     @Inject FastScrollUtils fastScrollUtils;
     @Inject EditorUtils editorUtils;
     @Inject ShortcutUtil shortcutUtil;
-    @Inject Clock clock;
     @Inject SyncedFolderProvider syncedFolderProvider;
     @Inject AppScanOptionalFeature appScanOptionalFeature;