Fix Coverage Settings (#438)

#384 Moved the coverage settings in pyproject.toml from the pytest
settings to the tox command. Some merge conflict kept the settings in
both places, which interferes with vscode debugging. This PR removes the
redundant settings.

pyproject.toml

@@ -79,7 +79,6 @@ namespace_packages = false # rely only on __init__ files to determine fully q
 # Run pytest with all our checkers, and don't spam us with massive tracebacks on error
 addopts = """
  --tb=native -vv --doctest-modules --doctest-glob="*.rst"
- --cov=blueapi --cov-report term --cov-report xml:cov.xml
  --ignore=src/blueapi/startup
  """
 # https://iscinumpy.gitlab.io/post/bound-version-constraints/#watch-for-warnings