linux-pipewire: Fix camera framerate listing

[tytan652]

Description

The SPA format (pixelformat) was compared with a libobs video format value.

Also removes the SPA format support check since at this point it already has been done while listing formats.

Motivation and Context

Fix a old oops-y (since the source addition)

How Has This Been Tested?

Untested

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

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

[dimtpap]

I ran into this when working on #11371 and can confirm it was causing some formats to list no framerates, at least before the unified FPS/resolution menu refactor, and this was the fix.

[GeorgesStavracas]

Oops