[Glitch] Use the new JSX transform everywhere

Port 8f66126b10 to glitch-soc

app/javascript/flavours/glitch/packs/share.jsx

@@ -2,7 +2,6 @@ import 'packs/public-path';
 import { loadPolyfills } from 'flavours/glitch/polyfills';
 import ready from 'flavours/glitch/ready';
 import ComposeContainer from 'flavours/glitch/containers/compose_container';
-import React from 'react';
 import { createRoot } from 'react-dom/client';
 
 function loaded() {