fix(run-windows): Add loopback exemption for desktop apps (#516)
fix(run-windows): Add loopback exemption for desktop apps (#516)

Ensure the loopback exemption is added for app for access to localhost (i.e., the packager server).

Fixes #515
lbochenek/react-native-windows,lbochenek/react-native-windows,lbochenek/react-native-windows,lbochenek/react-native-windows