Remove "--allow-http" Argument

[frinzekt]

The current version of code-server no longer has the argument "--allow-http". In effect, running

code-server

will result in the server not starting and saying

***** Please use the script in bin/code-server instead!
***** This script will soon be removed!
***** See the release notes at https://github.com/cdr/code-server/releases/tag/v3.4.0
Unknown option --allow-http

This pull request removes the argument "--allow-http", so that the code-server will still run.