fix voting access for restricted users

[cellio]

Fixes #2114. After checking for trying to vote on your own post, the votes controller now also checks if you are missing the "unrestricted" ability and this isn't an answer to your question. It's important that this is the second check, because we're calling owns_post_or_parent? instead of writing a new very similar check. If it's your post we've already bailed, so this is really just checking whether you own the parent.

I tested this manually with restricted and unrestricted users voting on their own posts, answers to their questions, and unrelated posts. I also pre-emptively ran rubocop before committing, so I'm not sure what's up with that test failure here.

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 80.94%. Comparing base (3966e46) to head (ed002f4).

Files with missing lines	Patch %	Lines
app/controllers/votes_controller.rb	75.00%	1 Missing ⚠️

Additional details and impacted files

Components	Coverage Δ
controllers	76.75% <75.00%> (-0.05%)	⬇️
helpers	85.47% <ø> (ø)
jobs	77.43% <ø> (ø)
models	93.14% <ø> (ø)
tasks	61.11% <ø> (ø)

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