Fix broken deliveryservice_requests query parameter

[ericholguin]

This PR fixes an issue where deliveryservice_requests query parameters are ignored if the xmlId parameter is used, for example:
deliveryservice_requests?xmlId=deliveryService&status=complete will still return other statuses, this issue applies to all other parameters used alongside xmlId but is not the case when they are used alongside each other.

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Which Traffic Control components are affected by this PR?

• Traffic Ops

What is the best way to verify this PR?

Build TO and verify one can query using all parameters in combination with xmlId

If this is a bugfix, which Traffic Control versions contained the bug?

Unsure

PR submission checklist

• This PR has tests
• This PR has documentation
• This PR has a CHANGELOG.md entry
• This PR DOES NOT FIX A SERIOUS SECURITY VULNERABILITY (see the Apache Software Foundation's security guidelines for details)

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (c0ebe87) 31.77% compared to head (8d81b3b) 31.80%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
...fic_ops_golang/deliveryservice/request/requests.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7893      +/-   ##
============================================
+ Coverage     31.77%   31.80%   +0.02%     
  Complexity       98       98              
============================================
  Files           719      719              
  Lines         82819    82819              
  Branches        970      970              
============================================
+ Hits          26318    26341      +23     
+ Misses        54338    54320      -18     
+ Partials       2163     2158       -5     

Flag	Coverage Δ
golib_unit	53.84% <ø> (ø)
grove_unit	12.02% <ø> (ø)
t3c_unit	5.88% <ø> (ø)
traffic_monitor_unit	25.47% <ø> (ø)
traffic_ops_integration	69.42% <ø> (ø)
traffic_ops_unit	21.63% <0.00%> (+0.04%)	⬆️
traffic_portal_v2	74.37% <ø> (+0.05%)	⬆️
traffic_stats_unit	10.78% <ø> (ø)
unit_tests	29.12% <0.00%> (+0.03%)	⬆️
v3	57.79% <ø> (ø)
v4	79.18% <ø> (ø)
v5	78.58% <ø> (ø)

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