Fixup glfw races in app package by respecting the ci flag we removed

[andydotxyz]

Removing a race because we're running GLFW app in app tests, which we shouldn't.
The ci tag marks when the code should run in a different mode (in this case for the app package race).

Checklist:

• Tests included. <- re-enabling an old build feature
• Lint and formatter run with no errors.
• Tests all pass.

[coveralls]

coverage: 60.867% (+0.009%) from 60.858%
when pulling 320a431 on andydotxyz:fix/cirace
into 3795a68 on fyne-io:develop.