Fix(run): arguments are incorrectly gathered leading to duplicates

[justinwilaby]

This PR fixes and issue with the run command where arguments after the -- which collide with the command flag names are duplicated leading to errors.

e.g. heroku run -e DOMAIN=test -- ruby -e 'puts ENV["ENV_KEY"]' <-- '-e' is a collision with the command flag alias for env and is duplicated and sent to the Dyno by mistake.

NOTE: Reverting the sorted args is no longer needed since a direct slice from the process.argv is performed. This operation has been removed.

[k80bowman]

I am still getting the original error with this fix:

This fix also reintroduces the bug we were trying to solve with the logic for re-sorting the args:

[k80bowman]

The commands are working now, thank you. 🎉

If we're not using the revertSortedArgs function any more, could you please remove it from the helpers file?

[k80bowman]

Thank you! Works great.