[typescript-rxjs] Update servers.mustache

[rainmanhhh]

add hasOwnProperty checking; use const instead of var

PR checklist

• Read the contribution guidelines.
• Pull Request title clearly describes the work in the pull request and Pull Request description provides details about how to validate the work. Missing information here may result in delayed response from the community.
• Run the following to build the project and update samples:

  ./mvnw clean package 
  ./bin/generate-samples.sh
  ./bin/utils/export_docs_generators.sh
  

  Commit all changed files.
  This is important, as CI jobs will verify all generator outputs of your HEAD commit as it would merge with master.
  These must match the expectations made by your contribution.
  You may regenerate an individual generator by passing the relevant config(s) as an argument to the script, for example ./bin/generate-samples.sh bin/configs/java*.
  For Windows users, please run the script in Git BASH.
• File the PR against the correct branch: master, 5.1.x, 6.0.x
• If your PR is targeting a particular programming language, @mention the technical committee members, so they are more likely to review the pull request.

[wing328]

Please follow the 3rd item in the PR checklist to update the samples so that the CI can test the change.

[rainmanhhh]

resolved indentation problem

[wing328]

cc @TiFu (2017/07) @taxpon (2017/07) @sebastianhaas (2017/07) @kenisteward (2017/07) @Vrolijkx (2017/09) @macjohnny (2018/01) @topce (2018/10) @akehir (2019/07) @petejohansonxo (2019/11) @amakhrov (2020/02)

[amakhrov]

Thanks for your contribution! The change looks good to me. But it seems that you also need to regenerate samples and commit the changes as a part of this PR (https://github.com/OpenAPITools/openapi-generator/blob/master/CONTRIBUTING.md#testing)

[macjohnny]

cc @denyo

[wing328]

there are trailing spaces in this line. will remove these in a separate PR.

[wing328]

tested locally with update samples and the result is good. will update the samples in another PR.