Fixed compatibility issue.

[shum0531]

Hello!

• Type: improvement
• Link to issue:

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 updated the CHANGELOG

Small description of change:

setImageAlpha () - fills the alpha channel with black before execution.
evaluateImage () is the best compatibility.

Thanks

[codecov]

Codecov Report

Merging #13911 into 4.0.x will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##            4.0.x   #13911      +/-   ##
==========================================
+ Coverage   67.85%   67.85%   +<.01%     
==========================================
  Files         468      468              
  Lines       93380    93378       -2     
==========================================
  Hits        63365    63365              
+ Misses      30015    30013       -2

Impacted Files	Coverage Δ
ext/phalcon/image/adapter/imagick.zep.c	77.51% <0%> (+0.1%)	⬆️

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[niden]

@shum0531 Can you please add a line to the CHANGELOG-v4 of what this PR does?

[niden]

Thank you @shum0531