Revert "fix(external_api) replace special chars in roomName before constructing URL"

This reverts commit 6f90458ff1.

react/features/base/util/uri.js

@@ -514,7 +514,7 @@ export function urlObjectToString(o: Object): ?string {
     // pathname
 
     // Web's ExternalAPI roomName
-    const room = _fixRoom(o.roomName || o.room);
+    const room = o.roomName || o.room;
 
     if (room
             && (url.pathname.endsWith('/')