Fix ComposeForm collapsing when clicking within emoji picker

app/soapbox/features/compose/components/compose_form.js

@@ -124,7 +124,7 @@ class ComposeForm extends ImmutablePureComponent {
       // FIXME: Make this less brittle
       this.getClickableArea(),
       document.querySelector('.privacy-dropdown__dropdown'),
-      document.querySelector('.emoji-picker-dropdown__menu'),
+      document.querySelector('em-emoji-picker'),
       document.getElementById('modal-overlay'),
     ].some(element => element?.contains(e.target));
   }

app/soapbox/features/emoji/components/emoji_picker_dropdown.tsx

@@ -1,4 +1,3 @@
-import classNames from 'classnames';
 import { supportsPassiveEvents } from 'detect-passive-events';
 import React, { useEffect, useState, useLayoutEffect } from 'react';
 import { createPortal } from 'react-dom';
@@ -208,7 +207,7 @@ const EmojiPickerDropdown: React.FC<IEmojiPickerDropdown> = ({ custom_emojis, fr
 
       {createPortal(
         <div
-          className={classNames({ 'z-1000': true })}
+          className='z-50'
           ref={setPopperElement}
           style={style}
           {...attributes.popper}