Form::clear() now correctly clears single fields

[SidRoberts]

Hello!

• Type: bug fix | code quality
• Link to issue: [BUG] Phalcon\Forms\Form::clear() variable never initialized #14217

In raising this pull request, I confirm the following:

• I have read and understood the Contributing Guidelines
• I have checked that another pull request for this purpose does not exist
• I wrote some tests for this PR
• I have updated the relevant CHANGELOG
• [-] I have created a PR for the documentation about this change

Small description of change:

Thanks

[codecov]

Codecov Report

Merging #14218 into 4.0.x will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##            4.0.x   #14218      +/-   ##
==========================================
+ Coverage   66.31%   66.31%   +<.01%     
==========================================
  Files         475      475              
  Lines      111767   111737      -30     
==========================================
- Hits        74115    74097      -18     
+ Misses      37652    37640      -12

Impacted Files	Coverage Δ
ext/phalcon/forms/form.zep.c	72.97% <0%> (+0.36%)	⬆️

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[scrnjakovic]

The issue I reported in #14217 is for 3.4.x version, I don't think it applies to 4.0 as Form::clear(), Element::clear(), Form::getValue() and Element::getValue() methods were re-written for 4.0 in #13500.

[SidRoberts]

@scrnjakovic I've added another PR (#14219) for 3.4.x.

[sergeyklay]

❤️

[sergeyklay]

Thank you