Remove react-if

[zakpatterson]

Frustrations caused by react-if in #605, #606, #607 make me want to remove react-if. If react-if doesn't see the correct DOM structure at runtime, then it throws out console warnings and has undefined behavior. So we can fix that at compile time, and we don't need react-if.

[codecov-commenter]

Codecov Report

Merging #608 (99f3a9e) into master (8483a8a) will decrease coverage by 0.02%.
The diff coverage is 48.00%.

@@            Coverage Diff             @@
##           master     #608      +/-   ##
==========================================
- Coverage   63.83%   63.80%   -0.03%     
==========================================
  Files         108      108              
  Lines        3644     3666      +22     
  Branches      552      560       +8     
==========================================
+ Hits         2326     2339      +13     
- Misses       1303     1312       +9     
  Partials       15       15              

Impacted Files	Coverage Δ
src/components/TaxPayer/PersonFields.tsx	16.66% <0.00%> (-3.34%)	⬇️
src/components/createPDF.tsx	3.33% <0.00%> (-0.24%)	⬇️
src/components/income/RealEstate.tsx	8.06% <0.00%> (-0.42%)	⬇️
src/components/income/W2JobInfo.tsx	7.14% <0.00%> (-0.55%)	⬇️
src/components/FormContainer.tsx	94.59% <100.00%> (+0.30%)	⬆️
src/components/Questions.tsx	95.83% <100.00%> (+0.83%)	⬆️
src/components/TaxPayer/Address.tsx	92.85% <100.00%> (+1.94%)	⬆️
src/irsForms/ScheduleEIC.ts	80.44% <0.00%> (ø)
src/irsForms/F1040.ts	78.09% <0.00%> (+0.47%)	⬆️
src/irsForms/worksheets/ChildTaxCreditWorksheet.ts	100.00% <0.00%> (+2.32%)	⬆️

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