post cell: ignore NotSibling error.

not relevant to us, because we programmatically insert that view.
caused the prod build to error out.

Clover/app/src/main/res/layout/cell_post.xml

@@ -22,7 +22,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:orientation="horizontal"
-    tools:ignore="RtlHardcoded,RtlSymmetry">
+    tools:ignore="RtlHardcoded,RtlSymmetry,NotSibling">
 
     <View
         android:id="@+id/filter_match_color"