[Glitch] autofocus the compose form again on /share

Port e73b55184b to glitch-soc

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

app/javascript/flavours/glitch/features/standalone/compose/index.js

@@ -9,7 +9,7 @@ export default class Compose extends React.PureComponent {
   render () {
     return (
       <div>
-        <ComposeFormContainer />
+        <ComposeFormContainer autoFocus />
         <NotificationsContainer />
         <ModalContainer />
         <LoadingBarContainer className='loading-bar' />