Auto merge of #17877 - canaltinova:font-face-refactoring, r=jdm
Auto merge of #17877 - canaltinova:font-face-refactoring, r=jdm

Cleanup @font-face rule constructor

Passing SourceLocation into constructor instead of assigning
immediately after construction cleans up the code and helps to
prevent leaving an invalid SourceLocation in the future.

- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors

<!-- Either: -->
- [X] These changes do not require tests because it's just a cleanup.

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