Fix for test_homescreen_delete_app on v1-train and v1.0.1

This includes the commit from pull request #979, plus changes to allow it to pass on v1-train and v1.0.1. The system banner is not visible on those builds, so we are watching the css classes instead.

`master` -> ignore
`v1-train` - > merge
`v1.0.1` -> merge