Citation key pattern generator should remove $ by default

[Enivex]

Is your suggestion for improvement related to a problem? Please describe.
I had an entry with the "title = {The {$N$}-vortex problem: Analytical techniques},", where the use of [veryshorttitle:lower] resulted in the name "newton2001$n$" instead of the expected "newton2001n" until I added $ to the list of characters to be removed.

Describe the solution you'd like
I can't imagine there's many people who would like the dollar signs here, so I see no reason not to add $ to the list by default.

[jnchin314]

/assign-me

[github-actions]

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