frontend: Remove native property in forms

[Warchamp7]

Description

Removes the native property from these widgets in the UI forms.

Motivation and Context

The only widgets that should ever need or have this property are the OBS render widgets like OBSQTDisplay.

I'm unsure how the property got added to these widgets.

How Has This Been Tested?

Compiled and ran OBS.

Types of changes

• Tweak (non-breaking change to improve existing functionality)

Checklist:

• I have read the contributing document.
• My code has been run through clang-format.
• My code follows the project's style guidelines
• My code is not on the master branch.
• My code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.