[Glitch] Add option to open original page in dropdowns of remote content in web UI

Port ef582dc4f2 to glitch-soc

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

app/javascript/flavours/glitch/features/account_timeline/containers/header_container.js

@@ -161,6 +161,13 @@ const mapDispatchToProps = (dispatch, { intl }) => ({
     }));
   },
 
+  onOpenAvatar (account) {
+    dispatch(openModal('IMAGE', {
+      src: account.get('avatar'),
+      alt: account.get('acct'),
+    }));
+  },
+
 });
 
 export default injectIntl(connect(makeMapStateToProps, mapDispatchToProps)(Header));