Remove unused current_volume global

[bharvey88]

Version: 26.7.22.1

What does this implement/fix?

• Follow-up to Remove Announce Volume #56: the volume restore removed there was the only reader of the current_volume global. This drops the now write-only global and its assignment in on_announcement.
• Targets the RemoveAnnounceVol branch so it merges into Remove Announce Volume #56, not beta directly. No version bump for the same reason.

Types of changes

• Bugfix (fixed change that fixes an issue)
• New feature (thanks!)
• Breaking change (repair/feature that breaks existing functionality)
• Dependency Update - Does not publish
• Other - Does not publish
• Website of github readme file update - Does not publish
• Github workflows - Does not publish

Checklist / Checklijst:

• The code change has been tested and works locally
• The code change has not yet been tested

If user-visible functionality or configuration variables are added/modified:

• Added/updated documentation for the web page

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