Quote parameters for 'get_option()' and 'files()' as for 'dependency()'

[wsw0108]

Replace this paragraph with a description of your changes and rationale.

Checklist:

• Did you update the CHANGELOG?
• If you introduced dependencies: Did you update the mesonlsp.spec, scripts/create_license_file.sh and all GitHub Actions files?
• Did you run a profiler, if you inserted a lot of C++ code, especially in the Lexer, Parser or the Type Analyzer?

Fixes #NNNN

[JCWasmx86]

Thank you