StatusReactionWrapper: put the picker in a portal

app/soapbox/components/status-reaction-wrapper.tsx

@@ -1,3 +1,4 @@
+import { Portal } from '@reach/portal';
 import React, { useState, useEffect, useRef } from 'react';
 
 import { simpleEmojiReact } from 'soapbox/actions/emoji-reacts';
@@ -105,12 +106,14 @@ const StatusReactionWrapper: React.FC<IStatusReactionWrapper> = ({ statusId, chi
         ref: setReferenceElement,
       })}
 
+      <Portal>
         <EmojiSelector
           placement='top-start'
           referenceElement={referenceElement}
           onReact={handleReact}
           visible={visible}
         />
+      </Portal>
     </div>
   );
 };