fix some codespell issues

[aw-was-here]

Summary by Sourcery

Bug Fixes:

• Correct spelling errors in function names and comments across the codebase.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR fixes spelling issues in the codebase by correcting function names and documentation text. The changes primarily involve renaming functions to use proper spacing in their names and fixing a typo in a documentation string.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Renamed functions to use consistent naming convention with underscores	Renamed '_fillinmetadata' to '_fill_inmetadata' Updated function call references to use the new name Renamed 'fillin' to 'fill_in' Updated recursive function call to use the new name	nowplaying/processes/trackpoll.py
Fixed typo in documentation string	Corrected 'ugprade' to 'upgrade' in the Qt Dialog class documentation	nowplaying/upgrade.py

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