android: fix adb reverse command in case of non-default port

android/scripts/run-packager.sh

 export RCT_METRO_PORT="${RCT_METRO_PORT:=8081}"
 echo "export RCT_METRO_PORT=${RCT_METRO_PORT}" > "${THIS_DIR}/../../node_modules/react-native/scripts/.packager.env"
 
-adb reverse tcp:8081 tcp:8081
+adb reverse tcp:$RCT_METRO_PORT tcp:$RCT_METRO_PORT
 
 if nc -w 5 -z localhost ${RCT_METRO_PORT} ; then
   if ! curl -s "http://localhost:${RCT_METRO_PORT}/status" | grep -q "packager-status:running" ; then