Fixed race condition between activity start and stop on Android.
Fixed race condition between activity start and stop on Android.

When activityStop is called quickly after activityStart, abort the
asynchronous operation for showing the progress if it has not yet
executed.
webratio/cordova-plugin-dialogs,webratio/cordova-plugin-dialogs,webratio/cordova-plugin-dialogs,webratio/cordova-plugin-dialogs