[javascript] fix use of isBasicBasic and isBasicBearer conditions

[tiffmaelite]

Follow-up of #15220 but for other generators

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*.
• File the PR against the correct branch: master (6.3.0) (minor release - breaking changes with fallbacks), 7.0.x (breaking changes without fallbacks)
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@CodeNinjai (2017/07) @frol (2017/07) @cliffano (2017/07)

[tiffmaelite]

@wing328 note: this is not only about documentation: it fixes the fact that the below lines would be generated in case of operations with bearer or signature auth