[Glitch] Add scrolling to Compare history modal

Port e8cb3ee827 to glitch-soc

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

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

@@ -1071,6 +1071,7 @@
   &__container {
     padding: 30px;
     pointer-events: all;
+    overflow-y: auto;
   }
 
   .status__content {