Redeploying ignores change of name when it was deployed with a custom name

[richard-cox]

• deploy an app, ensure that the name is overridden during the deploy stepper
• change the application name the normal way via the app summary page
• redeploy the app via the git tab
• the app is pushed using the stale name in the project env var... when it should use the app name
• when we redeploy we should apply the current name as an override?