UI: Remove unnecessary projector variable

[cg2121]

Description

This variable is not needed, as there is a screen() function.

Motivation and Context

Removes unneeded code.

How Has This Been Tested?

Disconnected monitor and made sure projector was deleted

Types of changes

• Code cleanup (non-breaking change which makes code smaller or more readable)

Checklist:

• [x] My code has been run through clang-format.
• [x] I have read the contributing document.
• [x] My code is not on the master branch.
• [x] The code has been tested.
• [x] All commit messages are properly formatted and commits squashed where appropriate.
• [x] I have included updates to all appropriate documentation.

[Fenrirthviti]

@RytoEX can you merge this?

Please do not ping maintainers asking for merges. If a PR is open, it's a safe bet we're aware of it and will get to it when time and priority allows.

This is especially bad etiquette on what is a simple code cleanup PR that doesn't have any functional change.

[RytoEX]

This needs a rebase. Would appreciate someone confirming that this works fine on a multi-display setup.

[cg2121]

Updated to latest master