[Glitch] Improved appearance of notification filter on safari

Port 2e1b5edfea to glitch-soc

app/javascript/flavours/glitch/styles/components/accounts.scss

@@ -451,10 +451,12 @@
   border-bottom: 1px solid lighten($ui-base-color, 8%);
   cursor: default;
   display: flex;
+  flex-shrink: 0;
 
   button {
     background: darken($ui-base-color, 4%);
     border: 0;
+    margin: 0;
   }
 
   button,