Delete duplicate base_flow.cr (#369)
Delete duplicate base_flow.cr (#369)

I believe that the intended `base_flow.cr` is found [here](https://github.com/luckyframework/lucky_cli/blob/master/src/browser_app_skeleton/spec/support/flows/base_flow.cr) and this one can be removed
luckyframework/cli,luckyframework/cli,luckyframework/cli