Redirect for app-root should preserve current scheme

[aledbf]

What this PR does / why we need it:

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Which issue/s this PR fixes

fixes #5261

How Has This Been Tested?

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added tests to cover my changes.
• All new and existing tests passed.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf

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• OWNERS [aledbf]

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[aledbf]

/test pull-ingress-nginx-test

[codecov-io]

Codecov Report

Merging #5266 into master will increase coverage by 0.02%.
The diff coverage is 56.25%.

@@            Coverage Diff             @@
##           master    #5266      +/-   ##
==========================================
+ Coverage   58.58%   58.61%   +0.02%     
==========================================
  Files          88       88              
  Lines        6879     6893      +14     
==========================================
+ Hits         4030     4040      +10     
- Misses       2407     2410       +3     
- Partials      442      443       +1     

Impacted Files	Coverage Δ
internal/ingress/controller/template/template.go	80.08% <0.00%> (ø)
internal/ingress/annotations/rewrite/main.go	51.11% <60.00%> (+2.72%)	⬆️
internal/ingress/metric/collectors/process.go	90.62% <0.00%> (+2.08%)	⬆️

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[aledbf]

/retest

[aledbf]

/retest

[aledbf]

/test pull-ingress-nginx-e2e-1-15