EmojiSelector: improve style of 3-dots icon

app/soapbox/components/ui/emoji-selector/emoji-selector.tsx

@@ -138,6 +138,7 @@ const EmojiSelector: React.FC<IEmojiSelector> = ({
 
           {all && (
             <IconButton
+              className='text-gray-600 hover:text-gray-600 dark:hover:text-white'
               src={require('@tabler/icons/dots.svg')}
               onClick={handleExpand}
             />