fix: Fix FormInput as textarea caret position when focusing

[diegohaz]

Closes #418

[codecov-io]

Codecov Report

Merging #420 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #420      +/-   ##
=========================================
+ Coverage   95.18%   95.2%   +0.01%     
=========================================
  Files          90      90              
  Lines        1351    1356       +5     
  Branches      420     423       +3     
=========================================
+ Hits         1286    1291       +5     
  Misses         65      65

Impacted Files	Coverage Δ
packages/reakit/src/Tabbable/Tabbable.ts	90.27% <100%> (+0.72%)	⬆️

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