fix: [Bearer_token] Use Query.Get when fetching QueryParameter

[marbergq]

Fix for bug where the bearer_token authn consumes body.
Instead of using r.FormValue which parses body (and thus consumes it, so it's not available to upstream services), we can just use r.URL.Query().Get(*tokenLocation.QueryParameter)

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #1106 (e4a3a24) into master (baeecc6) will increase coverage by 0.60%.
The diff coverage is 100.00%.

❗ Current head e4a3a24 differs from pull request most recent head a918d0e. Consider uploading reports for the commit a918d0e to get more accurate results

@@            Coverage Diff             @@
##           master    #1106      +/-   ##
==========================================
+ Coverage   77.64%   78.24%   +0.60%     
==========================================
  Files          80       80              
  Lines        3963     3843     -120     
==========================================
- Hits         3077     3007      -70     
+ Misses        607      564      -43     
+ Partials      279      272       -7     

Impacted Files	Coverage Δ
driver/configuration/provider_koanf.go	88.88% <ø> (ø)
helper/bearer.go	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

[aeneasr]

Awesome, thank you! 🎉 Your contribution makes Ory better :)