Once snapshot is added to android build user cannot build without it

tns version is 3.4.1

When once snapshot is added to android build it will always be included in the pack with the next builds even user do not want it.

To reproduce the problem just build first with snapshot 
`tns build android --bundle --env.snapshot`

and then build without snaphot
`tns build android --bundle`
Look in the result .apk file - snapshot is added, but shouldn'tt