pipx install --editable fails during package determination

[itsayellow]

Describe the bug
Regression from #302. I think significant.

Background: pip install --editable needs either a local directory or VCS spec right after the --editable switch.

The #302 code added --no-dependencies after all pip arguments when determining the package name. In editable pipx installs, this has the effect of putting --no-dependencies between --editable and the package specification in the pip install arguments, which is illegal for pip, causing package determination to fail.

In addition, main.py code puts pip_args after --editable which would cause the same bug if both --editable and --pip_args are used.

How to reproduce

carvel:pipx pipx install --verbose -e git+https://github.com/itsayellow/datadiary
pipx > (run_subprocess:108): running /usr/local/opt/python/bin/python3.7 -m venv --without-pip /var/folders/5n/rx81rh0d35nbq92pjf3jpl2r0000gn/T/tmpu4hpo780
pipx > (run_subprocess:108): running /var/folders/5n/rx81rh0d35nbq92pjf3jpl2r0000gn/T/tmpu4hpo780/bin/python --version
pipx > (run_subprocess:108): running /var/folders/5n/rx81rh0d35nbq92pjf3jpl2r0000gn/T/tmpu4hpo780/bin/python -m pip list --format=json
pipx > (run_subprocess:108): running /var/folders/5n/rx81rh0d35nbq92pjf3jpl2r0000gn/T/tmpu4hpo780/bin/python -m pip install --editable --no-dependencies git+https://github.com/itsayellow/datadiary
ERROR: --no-dependencies is not a valid editable requirement. It should either be a path to a local project or a VCS URL (beginning with svn+, git+, hg+, or bzr+).
pipx > (install_package_no_deps:222): '/var/folders/5n/rx81rh0d35nbq92pjf3jpl2r0000gn/T/tmpu4hpo780/bin/python -m pip install --editable --no-dependencies git+https://github.com/itsayellow/datadiary' failed
Cannot determine package name from spec 'git+https://github.com/itsayellow/datadiary'. Check package spec for errors.
carvel:pipx 

Expected behavior

Package should have been installed normally

[itsayellow]

Fixed by #323