#120: Call setParent(null) when removing a param from a group

[Airblader]

This pull request relates to or closes the following issues:

I have verified that…

• [ ] the commits in this pull request follow the conventionalcommits pattern
• [ ] tests have been updated or added
• [ ] documentation has been updated to reflect the changes made

[codecov[bot]]

Codecov Report

Merging #125 into master will increase coverage by 0.06%. The diff coverage is 75%.

@@            Coverage Diff             @@
##           master     #125      +/-   ##
==========================================
+ Coverage   85.29%   85.35%   +0.06%     
==========================================
  Files          25       25              
  Lines         721      724       +3     
  Branches      111      111              
==========================================
+ Hits          615      618       +3     
  Misses         51       51              
  Partials       55       55

Impacted Files	Coverage Δ
...jects/ngqp/core/src/lib/model/query-param-group.ts	98.14% <100%> (+0.07%)	:arrow_up:
projects/ngqp/core/src/lib/model/query-param.ts	93.33% <50%> (+0.07%)	:arrow_up:

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