fix(rn,config) don't disable multi-stream sending on RN

We don't plan to send both (camera and screen) streams at once, but we
do plan to align with web and have both streams at the same time, with
the camera being muted when we start screen sharing.

react/features/base/config/functions.any.ts

@@ -60,7 +60,7 @@ export function getMeetingRegion(state: IReduxState) {
  * @returns {boolean}
  */
 export function getMultipleVideoSendingSupportFeatureFlag(state: IReduxState) {
-    return navigator.product !== 'ReactNative' && isUnifiedPlanEnabled(state);
+    return isUnifiedPlanEnabled(state);
 }
 
 /**