linux-pipewire: Remove unused variables

[kkartaltepe]

Description

Deletes some unused variables.

Motivation and Context

These break builds eventually, not sure why they don't right now.

How Has This Been Tested?

It builds.

Types of changes

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

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.

[RytoEX]

8bcf266#diff-12619fdf5b78428302136e0272174358004ba1bfdbf3ee60ccae48e4613e587d

Do you want to also catch this?

g_autoptr(GHashTable) framerates_map = NULL;

[kkartaltepe]

Thanks added all the pipewire changes from Pat's fixup so he can just drop the pipewire files.

[RytoEX]

I had already reviewed these on #9787, so these look fine to me. Going to let CI confirm.