fix: showInMentions attribute is now serialized correctly (#2137)
fix: showInMentions attribute is now serialized correctly (#2137)

This was an error introduced in ec94869. Instead of the
Qt::CheckStateRole, which stores the state represented in the table
view, the Qt::DisplayRole was used. As per [1], this always returns
`false` in our use case.

[1]: https://doc.qt.io/qt-5/qvariant.html#toBool
hemirt/chatterino2,fourtf/chatterino2,Cranken/chatterino2,Cranken/chatterino2,hemirt/chatterino2,hemirt/chatterino2,fourtf/chatterino2,fourtf/chatterino2,Cranken/chatterino2,Cranken/chatterino2,hemirt/chatterino2