Fix issues with uncommon Santa target IDs

[np5]

• Relax Signing ID verification
• Fix Signing ID search
• Fix Team ID search
• Fix rule creation form

[coveralls]

Pull Request Test Coverage Report for Build 8814803155

Details

• 8 of 9 (88.89%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 78.521%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
zentral/contrib/santa/forms.py	6	7	85.71%
<!--	Total:	8	9	88.89%	-->

Totals
Change from base Build 8719897290:	0.03%
Covered Lines:	35617
Relevant Lines:	45360

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💛 - Coveralls