Increase touch area for header icons

On narrow screens only the action icons are shown in the multiselect
header of the file list. In that case the padding of those icons is
increased to provide a larger touch area (the padding used is the same
as in the inline actions of the file list).

Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>

apps/files/css/mobile.scss

@@ -84,4 +84,9 @@ table.dragshadow {
 	table th .selectedActions a span:not(.icon) {
 		display: none;
 	}
+
+	/* Increase touch area for the icons */
+	table th .selectedActions a {
+		padding: 17px 14px;
+	}
 }