fix: redirect servers bug

[oilbeater]

What this PR does / why we need it:
The key-value place for origin server and redirect server is wrong
Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #2230

Special notes for your reviewer:

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov-io]

Codecov Report

Merging #2248 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #2248      +/-   ##
==========================================
- Coverage   37.13%   37.11%   -0.02%     
==========================================
  Files          71       71              
  Lines        5025     5025              
==========================================
- Hits         1866     1865       -1     
- Misses       2874     2876       +2     
+ Partials      285      284       -1

Impacted Files	Coverage Δ
internal/ingress/controller/nginx.go	5.13% <0%> (ø)	⬆️
internal/watch/file_watcher.go	80.76% <0%> (-3.85%)	⬇️

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