Fixed input box validation logic

[Blackbaud-PaulCrowder]

No description provided.

[codecov]

Codecov Report

Merging #171 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #171   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           32        32           
  Lines          889       897    +8     
  Branches       170       175    +5     
=========================================
+ Hits           889       897    +8     

Impacted Files	Coverage Δ
...pp/public/modules/input-box/input-box.component.ts	100.00% <100.00%> (ø)

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[blackbaud-ado]

Preview build at https://host.nxt.blackbaud.com/skyux-forms?_sp.spa=pr-input-box-error-state-fix