Better styling applied to Recents pane for mobile.

- Change padding at bottom of the tree to gap in multipane.

src/ui/layout/pane.scss

@@ -14,15 +14,15 @@
     &--vertical,
     > .l-pane {
         flex-flow: column nowrap;
-
-        body.mobile & {
-            padding-bottom: $interiorMarginLg;
-        }
     }
 
     &--vertical {
         height: 100%;
 
+        body.mobile & {
+            gap: $interiorMargin;
+        }
+
         > .l-pane .l-pane__contents {
             padding-right: $interiorMarginSm; // Fend off scrollbar
         }