feat: Hide empty slider icons in Tabs - MEED-2846 - Meeds-io/MIPs#100 (…

…#703)

Prior to this change, when a Tab list overflows comparing to its parent
container, the disabled arrow icon isn't displayed and a blank square is
displayed instead. This change will hide the arrow container when not
active.

platform-ui-skin/src/main/webapp/skin/less/vuetify/vuetify-all.less

@@ -335,6 +335,10 @@
       margin-left: -23px;
       margin-top: -23px;
     }
+    .v-slide-group__next--disabled,
+    .v-slide-group__prev--disabled {
+      display: none;
+    }
 
     .warning {
       background: @warningBackground !important;