kte: Fix parameter declaration for generated templates

[marcospereira]

What?

Given the following template:

@param name: String
@param age: Int? = null

The generated code for Kotlin's renderMap would have:

@JvmStatic fun renderMap(jteOutput:gg.jte.html.HtmlTemplateOutput, jteHtmlInterceptor:gg.jte.html.HtmlInterceptor?, params:Map<String, Any?>) {
	val name = params["name"] as String
	val age = params["age"] as Int?? ?: null
	render(jteOutput, jteHtmlInterceptor, name, age);
}

There are two issues here:

1. The double ? in Int?? generates a warning (Redundant '?')
2. The section ?: null also generates a warning (Right operand of elvis operator (?:) is useless if it is null).

This PR fixes both warnings.

[marcospereira]

@casid @edward3h, I'm unsure if this is the best way/place to test it, but let me know what you think.

[casid]

Looks good, I'd say!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7ad2e12) 91.20% compared to head (dc8ef75) 91.23%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #319      +/-   ##
============================================
+ Coverage     91.20%   91.23%   +0.02%     
- Complexity     1211     1216       +5     
============================================
  Files            76       76              
  Lines          3151     3159       +8     
  Branches        492      492              
============================================
+ Hits           2874     2882       +8     
  Misses          164      164              
  Partials        113      113              

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[casid]

Thank you @marcospereira!