Correctly detect hook template directory

[gabyx]

• in the update case, we need to include a set githooks.useCoreHooksPath and warn and fail if we did not find a template directory after checking the default locations.

Thanks for merging.

Maybe later an additional update in 114. But not much time now.

[coveralls]

Pull Request Test Coverage Report for Build 827

• 12 of 19 (63.16%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.04%) to 80.557%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
install.sh	12	19	63.16%
<!--	Total:	12	19	63.16%	-->

Totals
Change from base Build 825:	-0.04%
Covered Lines:	2370
Relevant Lines:	2942

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💛 - Coveralls

[rycus86]

I don't fully understand what's the problem here, perhaps a test might be good to make sure this doesn't regress.

[gabyx]

Added the test, which fails when you checkout it.