remove unused imports

Signed-off-by: Abdourahamane BOINAIDI <abdourahamane.boinaidi@infomaniak.com>

src/main/java/com/owncloud/android/ui/adapter/OCFileListAdapter.java

@@ -37,8 +37,6 @@ import android.graphics.drawable.Drawable;
 import android.os.Handler;
 import android.os.Looper;
 import android.text.TextUtils;
-import android.util.DisplayMetrics;
-import android.view.Gravity;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;