cleanup imports for codacy

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

@@ -36,8 +36,6 @@ import android.os.Looper;
 import android.support.annotation.Nullable;
 import android.support.annotation.StringRes;
 import android.support.design.widget.BottomNavigationView;
-import android.support.design.widget.BottomSheetBehavior;
-import android.support.design.widget.BottomSheetDialog;
 import android.support.design.widget.Snackbar;
 import android.support.v4.app.FragmentActivity;
 import android.support.v4.widget.DrawerLayout;
@@ -55,10 +53,8 @@ import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.AbsListView;
-import android.widget.ImageView;
 import android.widget.PopupMenu;
 import android.widget.RelativeLayout;
-import android.widget.TextView;
 
 import com.owncloud.android.MainApp;
 import com.owncloud.android.R;