fix(builder) set strip_path after defaults

[rainest]

Edit: the original rationale was wrong, I didn't realize we needed to re-add the mergo replace to KIC modules. This is now only the test.

Kong/kubernetes-ingress-controller#2286 failed when trying to add v1.11.0 to KIC. Something appears to have happened after I tested with #573.

Within ingresRoute, the value is false as expected after it's set to the result of getStripPathBasedOnProtocols(). It flips back to true after https://github.com/Kong/deck/blob/v1.11.0/file/builder.go#L786

I thought this maybe meant something didn't work as expected with #580, but as these were already *bool any non-nil value is not zero, so I'm not sure why the default was merging over the original value.

The change here does fix the issue, but I'd like to better understand what's going on here if possible.

[codecov-commenter]

Codecov Report

Merging #596 (cec1ac2) into main (4235c73) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #596      +/-   ##
==========================================
+ Coverage   50.39%   50.46%   +0.07%     
==========================================
  Files          74       74              
  Lines        8277     8279       +2     
==========================================
+ Hits         4171     4178       +7     
+ Misses       3728     3725       -3     
+ Partials      378      376       -2     

Impacted Files	Coverage Δ
file/builder.go	56.62% <100.00%> (+0.81%)	⬆️

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