fix(rn,polyfills) remove no longer needed polyfill

Fixes: https://github.com/jitsi/jitsi-meet/issues/13807

react/features/mobile/polyfills/bundler.js

@@ -1,8 +0,0 @@
-(global => {
-
-    // __filename
-    if (typeof global.__filename === 'undefined') {
-        global.__filename = '__filename';
-    }
-
-})(global || window || this); // eslint-disable-line no-invalid-this

react/features/mobile/polyfills/index.js

@@ -1,3 +1,2 @@
-import './bundler';
 import './browser';
 import './custom';