Songs with sequential collatable artist or title are duplicated in db on every load

[BWagener]

Performous & operating system versions

Performous: master 41b7637 Operating system: Windows 11 Pro N and Steam OS 3.5.19

What is the problem?

When a song's artist or title starts with two or more "collatable" words (words defined in config[game/sorting_ignore]) it is duplicated in the DB whenever it is loaded from cache.

Steps to reproduce

Change a song's artist or title to fit the criteria above, some examples:

• Alejandro Sanz - A la primera persona
• Ed Sheeran - The A Team
• La La Land (Emma Stone) - Audition (The Fools Who Dream)

Start up the game, close it, start it again, close it.

First save:

    <song id="0" artist="Alejandro Sanz" title="la primera persona,A"/>
    <song id="1" artist="Ed Sheeran" title="A Team,The"/>
    <song id="3" artist="La Land (Emma Stone),La" title="Audition (The Fools Who Dream)"/>
    ...

Second save:

    <song id="0" artist="Alejandro Sanz" title="primera persona,A,la"/>
    <song id="1" artist="Ed Sheeran" title="Team,The,A"/>
    <song id="3" artist="Land (Emma Stone),La,La" title="Audition (The Fools Who Dream)"/>
    ...
    <song id="10" artist="Alejandro Sanz" title="la primera persona,A"/>
    <song id="11" artist="Ed Sheeran" title="A Team,The"/>
    <song id="13" artist="La Land (Emma Stone),La" title="Audition (The Fools Who Dream)"/>
    ...

Third save:

    <song id="0" artist="Alejandro Sanz" title="primera persona,A,la"/>
    <song id="1" artist="Ed Sheeran" title="Team,The,A"/>
    <song id="3" artist="Land (Emma Stone),La,La" title="Audition (The Fools Who Dream)"/>
    ... 
    <song id="10" artist="Alejandro Sanz" title="primera persona,A,la"/>
    <song id="11" artist="Ed Sheeran" title="Team,The,A"/>
    <song id="13" artist="Land (Emma Stone),La,La" title="Audition (The Fools Who Dream)"/>
    ...
    <song id="20" artist="Alejandro Sanz" title="la primera persona,A"/>
    <song id="21" artist="Ed Sheeran" title="A Team,The"/>
    <song id="23" artist="La Land (Emma Stone),La" title="Audition (The Fools Who Dream)"/>
    ...

Additional context

https://github.com/performous/performous/pull/989 coincidentally works around this issue most of the times, as long as the cache is not deleted.

As a proper solution I would suggest only ever saving the unmodified artist and title like outlined in this PR: #993

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