feat: Enables simulcast on the mobile app. (#661)

modules/RTC/RTCBrowserType.js

         return RTCBrowserType.isChrome()
             || RTCBrowserType.isFirefox()
             || RTCBrowserType.isElectron()
-            || RTCBrowserType.isNWJS();
+            || RTCBrowserType.isNWJS()
+            || RTCBrowserType.isReactNative();
     },
 
     supportsRtx() {