fix: Fix Checkbox activating twice on space key on Firefox

[diegohaz]

Closes #368

The Clickable component wasn't considering inputs, so the space key up was triggering another click on the checkbox.

I can't write a test for this because it checks for event.isTrusted, and, on tests, this is always false.

Does this PR introduce a breaking change?

No

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Sandbox	Source
gallant-swanson-p3pz9	Configuration
Reakit	Issue #368

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[codecov]

Codecov Report

Merging #625 into master will decrease coverage by 0.20%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #625      +/-   ##
==========================================
- Coverage   95.56%   95.36%   -0.21%     
==========================================
  Files         121      121              
  Lines        2369     2374       +5     
  Branches      673      677       +4     
==========================================
  Hits         2264     2264              
- Misses        105      110       +5     

Impacted Files	Coverage Δ
packages/reakit/src/Clickable/Clickable.ts	86.95% <0.00%> (-10.61%)	⬇️

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[diegohaz]

Looks like it's fixed on the CodeSandbox. @tom-sherman, could you please take a look?

[tom-sherman]

LGTM! 😄