[Glitch] Add purple border to active compose field search inputs

Port 1c87cb8019 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/styles/emoji_picker.scss

@@ -112,9 +112,11 @@
       border: 0;
     }
 
-    &:focus,
-    &:active {
+    &:active,
+    &:focus {
       outline: none !important;
+      border-width: 1px !important;
+      border-color: $ui-button-background-color;
     }
 
     &::-webkit-search-cancel-button {