fix: ignore query string when using X-Forwarded-Uri

[pingiun]

Related issue(s)

Fixes #1003

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
  confirm that I got the approval (please contact
  security@ory.sh) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• N/A: I have added or changed the documentation.

Further Comments

[codecov]

Codecov Report

Merging #1025 (8e6a712) into master (b9365a6) will decrease coverage by 0.86%.
The diff coverage is 100.00%.

❗ Current head 8e6a712 differs from pull request most recent head 7be1366. Consider uploading reports for the commit 7be1366 to get more accurate results

@@            Coverage Diff             @@
##           master    #1025      +/-   ##
==========================================
- Coverage   78.70%   77.83%   -0.87%     
==========================================
  Files          83       82       -1     
  Lines        3869     3952      +83     
==========================================
+ Hits         3045     3076      +31     
- Misses        554      597      +43     
- Partials      270      279       +9     

Impacted Files	Coverage Δ
api/decision.go	95.55% <100.00%> (ø)
internal/cloudstorage/setup.go	60.13% <0.00%> (-9.10%)	⬇️
x/url.go	60.00% <0.00%> (ø)
x/trace.go	75.00% <0.00%> (ø)
api/rule.go	52.17% <0.00%> (ø)
cmd/root.go	15.38% <0.00%> (ø)
x/router.go	100.00% <0.00%> (ø)
cmd/rules.go	50.00% <0.00%> (ø)
cmd/serve.go	100.00% <0.00%> (ø)
... and 74 more

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[pingiun]

@aeneasr could I get a review on this? This is basically a perfect PR:

• It fixes a real bug that blocks some people from using oathkeeper (unable to use traefik+oathkeeper currently)
• It's very small, easy to review
• It includes tests

I don't want to keep updating my branch from master, just to get no responses

[aeneasr]

Absolutely, sorry for the long review time and ping! :)