Don't skip hooks when checking out file from old commit

[stefanhaller]

• PR Description

In #4313 we disabled post-checkout hooks when discarding file changes. We went a little too far with this and also disabled the hook when checking out a file from an older commit; this was a mistake, and it is fixed here.

• Please check if the PR fulfills these requirements

• Cheatsheets are up-to-date (run go generate ./...)
• Code has been formatted (see here)
• Tests have been added/updated (see here for the integration test guide)
• Text is internationalised (see here)
• If a new UserConfig entry was added, make sure it can be hot-reloaded (see here)
• Docs have been updated if necessary
• You've read through your own file changes for silly mistakes etc

[jesseduffield]

LGTM

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
Report missing for 19ac9261	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (19ac926)	Report Missing	Report Missing	Report Missing
Head commit (ccc0861)	53226	46112	86.63%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#4371)	48	48	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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Footnotes

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[stefanhaller]

Obsolete after #4313 has been reverted; closing.