Fixed checkbox component, position of hidden input

[Blackbaud-SteveBrush]

Addresses: #1219

[codecov-io]

Codecov Report

Merging #1256 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1256   +/-   ##
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  Coverage     100%    100%           
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  Files         355     355           
  Lines        6635    6635           
  Branches      854     854           
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  Hits         6635    6635

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[Blackbaud-BobbyEarl]

For some reason, this felt very familiar to me so I searched back through skyux1.

We seemed to have fixed a similar bug in skyux1 via blackbaud/skyux#340 but then later applied a different fix via blackbaud/skyux@4928332#diff-b8edbd343ad0548b0b7464d4d1dc63b1

Is there any similarity here?

[Blackbaud-SteveBrush]

@Blackbaud-BobbyEarl I didn't notice many similarities between the issues you shared (thanks!) and this particular branch. I did test it on the Safari iOS agent to be sure, however.