Settings: GBM - hide "Display mode" setting

[a1rwulf]

I think this setting makes no sense for gbm.

Description

Settings show something like <?0?> for me and kodi locks up in a black screen if you change it.

Motivation and Context

Windowed mode in GBM is not possible right?

How Has This Been Tested?

Linux GBM -> Setting is not there anymore

Types of change

• Bug fix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves existing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

@lrusak not sure how it was handled before, maybe you have another idea?

[a1rwulf]

ping @lrusak in case it slipped through.

[lrusak]

Thanks! On LE we are doing the same thing already and I just never noticed....