[Glitch] Remove hardcoded width from dropdown overlays

Port f4a6365f55 to glitch-soc

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

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

@@ -13,7 +13,7 @@
 
 .emoji-picker-dropdown__menu {
   background: $simple-background-color;
-  position: absolute;
+  position: relative;
   box-shadow: 4px 4px 6px rgba($base-shadow-color, 0.4);
   border-radius: 4px;
   margin-top: 5px;