[Warchamp7]

Description

Removes the warning icon for legacy plugins from the plugin manager window.

Before

After

Closes https://github.com/obsproject/internal/issues/31

Motivation and Context

Based on user feedback during beta, the warning icon makes the plugin manager dialog more alarming than it needs to be at this current point in time.

Tracking issue for re-enabling this icon is at #14029

How Has This Been Tested?

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.