Fix deploying Dashboard on a sub-paths

[floreks]

Fixes #5017

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floreks

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [floreks]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[codecov]

Codecov Report

Merging #5022 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5022      +/-   ##
==========================================
+ Coverage   45.42%   45.42%   +<.01%     
==========================================
  Files         214      214              
  Lines       10066    10078      +12     
  Branches       98      100       +2     
==========================================
+ Hits         4572     4578       +6     
- Misses       5226     5232       +6     
  Partials      268      268

Impacted Files	Coverage Δ
...p/frontend/common/services/global/notifications.ts	35.84% <0%> (-2.25%)	⬇️
.../frontend/common/services/global/globalsettings.ts	39.53% <0%> (+0.64%)	⬆️
src/app/backend/settings/handler.go	33.33% <0%> (+2.08%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4d047bb...67214d3. Read the comment docs.