Tweak catalog mode margin

Clover/app/src/main/java/org/floens/chan/ui/layout/ThreadListLayout.java

@@ -167,7 +167,6 @@ public class ThreadListLayout extends FrameLayout implements ReplyLayout.ReplyLa
                     break;
                 case CARD:
                     GridLayoutManager gridLayoutManager = new GridLayoutManager(null, spanCount, GridLayoutManager.VERTICAL, false);
-                    // The cards have a 1dp padding, this way there is always 2dp between the edges
                     recyclerViewTopPadding = dp(1);
                     recyclerView.setPadding(dp(1), recyclerViewTopPadding + toolbarHeight(), dp(1), dp(1));
                     recyclerView.setLayoutManager(gridLayoutManager);

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

@@ -23,7 +23,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
     android:layout_margin="@dimen/grid_card_margin"
     card_view:cardBackgroundColor="?backcolor"
     card_view:cardCornerRadius="@dimen/grid_card_corner_radius"
-    card_view:cardElevation="1dp">
+    card_view:cardElevation="2dp">
 
     <org.floens.chan.ui.layout.FixedRatioLinearLayout
         android:id="@+id/card_content"

Clover/app/src/main/res/values-v21/dimens.xml

@@ -16,6 +16,6 @@ You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 -->
 <resources>
-    <dimen name="grid_card_margin">0dp</dimen>
+    <dimen name="grid_card_margin">2dp</dimen>
     <dimen name="grid_card_corner_radius">2dp</dimen>
 </resources>