add more coverage

[vaikas]

Fixes #4968

Proposed Changes

• Get them coverage numbers up for trigger / controller

Release Note

Docs

[knative-metrics-robot]

The following is the coverage report on the affected files.
Say /test pull-knative-eventing-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/reconciler/mtbroker/trigger/controller.go	81.5%	88.9%	7.4
pkg/reconciler/mtbroker/trigger/trigger.go	80.0%	87.0%	7.0

[codecov]

Codecov Report

Merging #4999 (954128e) into master (fba3dbf) will increase coverage by 0.16%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4999      +/-   ##
==========================================
+ Coverage   81.63%   81.80%   +0.16%     
==========================================
  Files         294      294              
  Lines        8392     8392              
==========================================
+ Hits         6851     6865      +14     
+ Misses       1135     1125      -10     
+ Partials      406      402       -4     

Impacted Files	Coverage Δ
pkg/reconciler/mtbroker/trigger/trigger.go	81.53% <100.00%> (+8.46%)	⬆️
pkg/reconciler/mtbroker/trigger/controller.go	92.10% <0.00%> (+7.89%)	⬆️

---

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[n3wscott]

/lgtm
/approve

Thanks!!!!

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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