[Tasks] Update tasks in all zones if invalid zone set

[hgtw]

This allows task elements to update in any zone when it has an invalid zone id <= 0. This has the same effect as leaving the zones field empty except "Unknown Zone" instead of "ALL" will be shown in task windows.

Note that Titanium shows "ALL" for a zone id of 0 despite it being an invalid zone id. This could be manipulated server side to match newer clients but there isn't much benefit since any other invalid zone id below 0 can be used to do the same.

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

Checklist

• I have tested my changes
• I have performed a self-review of my code. Ensuring variables, functions and methods are named in a human-readable way, comments are added only where naming of variables, functions and methods can't give enough context.
• I have made corresponding changes to the documentation (if applicable, if not delete this line)
• I own the changes of my code and take responsibility for the potential issues that occur
• If my changes make database schema changes, I have tested the changes on a local database (attach image). Updated version.h CURRENT_BINARY_DATABASE_VERSION to the new version. (Delete this if not applicable)