Fix-issue 11948

[Kaven668]

Describe the changes you have made here: what, why, ...
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[koppor]

This fixes #11948

[koppor]

The current code DOES NOT fix the issue.

_ still needs tobe disallowed in the title

It should be allowed in the citation key.

The issue states:

Modify org.jabref.logic.integrity.LatexIntegrityChecker#check to ignore error TTEM03 in the citation key (org.jabref.model.entry.field.InternalField#KEY_FIELD)

Please re-try.