Removed duplicate running of pygeoapi in serve cli command

[ricardogsilva]

Overview

This PR removes the additional calling of click's ctx.forward() which was causing duplicate launching of pygeoapi's web app when used via pygeoapi serve, as mentioned in #1504

Related issue / discussion

• fixes pygeoapi serve runs pygeoapi web application twice #1504

Dependency policy (RFC2)

• I have ensured that this PR meets RFC2 requirements

Updates to public demo

• I have ensured that breaking changes to the pygeoapi master demo server have been addressed
  • https://github.com/geopython/demo.pygeoapi.io/blob/master/services/pygeoapi_master/local.config.yml

Contributions and licensing

(as per https://github.com/geopython/pygeoapi/blob/master/CONTRIBUTING.md#contributions-and-licensing)

• I'd like to contribute [feature X|bugfix Y|docs|something else] to pygeoapi. I confirm that my contributions to pygeoapi will be compatible with the pygeoapi license guidelines at the time of contribution
• I have already previously agreed to the pygeoapi Contributions and Licensing Guidelines