fix(quickemu): Pipewire failed to use on servers

[danicaStarR]

• fix: handle Pipewire fallback

Description

After process check passed, double-check the D-bus. Once grep returns false(1), it will try to fallback.

My changes not tested on other devices.

• Closes bug: PipeWire Bus Down Error after updated v4.9.8 from v4.9.7 #1838

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Packaging (updates the packaging)
• Documentation (updates the documentation)

Checklist:

• I have performed a self-review of my code
• I have tested my code in common scenarios and confirmed there are no regressions
• I have added comments to my code, particularly in hard-to-understand sections
• I have made corresponding changes to the documentation (remove if no documentation changes were required)

[cubic-dev-ai]

No issues found across 1 file

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

[flexiondotorg]

Thank you very much for the detailed bug report and this pull request 🙇

I'm going to look into this as the audio backend selection is starting to get a bit complex, and I'd like to find a simpler solution.

[danicaStarR]

#1839 repeat