fix #1570: Fix quickslot border css bug

src/client/ui/templates/hud/styles.less

@@ -112,7 +112,6 @@
 			width: 80px;
 			height: 80px;
 			background-color: fade(#3a3b4a, 90%);
-			margin-bottom: 8px;
 			cursor: pointer;
 			padding: 8px;
 			position: relative;