upgrade: regenerate zebrunner-proxy nginx.conf

[vdelendik]

zebrunner-proxy nginx.conf.original is updated in 1.24 release.
during new setup it should be auto-populated automatically but as part of the upgrade we have to replace it from .original. It seems like no changes inside but anyway let's create a backup.

[vdelendik]

done. patch/1.8.sh script should regenerate zebrunner-proxy/nginx.conf using original.

test scenario:

1. clone and setup zebrunner from master branch (pre-upgrade scenario)
2. run full_regression to register set of jobs
3. switch into the develop and do recursive pull

git checkout develop
git pull --recurse-submodules
./zebrunner.sh upgrade

4. after services restart login into the reporting and review web tests
   -> runs and tests should be opened successfully
   -> screenshots should be available
5. run more jobs to test that screenshots might be registered on new version as well

[ghost]

Verified. Fixed.