Replace aside:not(.right-sidebar) with display properties

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

app/assets/javascripts/boards/components/modal/empty_state.vue

@@ -45,7 +45,7 @@ export default {
   <section class="empty-state">
     <div class="row">
       <div class="col-12 col-md-6 order-md-last">
-        <aside class="svg-content"><img :src="emptyStateSvg" /></aside>
+        <aside class="svg-content d-none d-md-block"><img :src="emptyStateSvg" /></aside>
       </div>
       <div class="col-12 col-md-6 order-md-first">
         <div class="text-content">

app/assets/stylesheets/framework/mobile.scss

@@ -63,9 +63,3 @@
     }
   }
 }
-
-@include media-breakpoint-down(sm) {
-  aside:not(.right-sidebar) {
-    display: none;
-  }
-}