Change HTML input tags to use HTML5 syntax.

[jbampton]

In XHTML, the tag must be properly closed, like this <input />. In HTML5 the <input> tag has no ending slash. https://www.w3schools.com/tags/tag_input.asp

[codecov]

Codecov Report

Merging #1617 into master will decrease coverage by 0.2%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1617      +/-   ##
==========================================
- Coverage   99.47%   99.27%   -0.21%     
==========================================
  Files          36       39       +3     
  Lines        1918     1931      +13     
==========================================
+ Hits         1908     1917       +9     
- Misses          6       10       +4     
  Partials        4        4

Impacted Files	Coverage Δ
errors.go	100% <0%> (ø)	⬆️
mode.go	90.9% <0%> (ø)	⬆️
render/json_17.go	100% <0%> (ø)
response_writer_1.8.go	0% <0%> (ø)
context_17.go	100% <0%> (ø)

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