[Glitch] Rework polyfills loading

Port a3a2414f0e to glitch-soc

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

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

@@ -1,5 +1,5 @@
 import 'packs/public-path';
-import loadPolyfills from 'flavours/glitch/load_polyfills';
+import { loadPolyfills } from 'flavours/glitch/polyfills';
 import ComposeContainer from 'flavours/glitch/containers/compose_container';
 import React from 'react';
 import ReactDOM from 'react-dom';