Fix home command reset

[OneLiteFeather]

Overview

This PR should fix the missing reset happening while /p sethome none was executed. I had help with @TheMeinerLP which found the underlying solution together with me, as I am not a great developer with basic sql knowledge yet.

Fixes #4294

Description

• We fixed the setposition method with the default value and added a comment too to give other developers a hint to look it up on the statement. Also we added a location not null check because the issue lies within the equals implementation.

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[PierreSchwang]

The one comment, which is not a dealbreaker but not really required.

No idea who introduced the default value as "DEFAULT" instead of just making the column nullable?