[RN] Prefer H.264

react/features/base/lib-jitsi-meet/reducer.js

         // place). Fortunately, these pieces of JavaScript currently involve
         // third parties and we can temporarily disable them (until we implement
         // an alternative to async script elements on React Native).
-        disableThirdPartyRequests: true
+        disableThirdPartyRequests: true,
+        preferH264: true
     },
     initializationError: null,
     initialized: false