fixed bugs where first openconnect arg is deleted

[epichub]

have not really double checked all possible inputs here, but this patch fixes the where where given the cli arguments; openconnect-sso .. -- args1topenconnect where both https://github.com/vlaci/openconnect-sso/blob/master/openconnect_sso/cli.py#L124 and https://github.com/vlaci/openconnect-sso/blob/master/openconnect_sso/cli.py#L125 removes the first argument - effectively removing two arguments "--" and "args1openconnect"..

[vlaci]

Originally changed by https://github.com/vlaci/openconnect-sso/commit/9ed960f5c660fcb76a18b80a5ade286cff9b62e4

https://github.com/vlaci/openconnect-sso/issues/30

[epichub]

Hey @vlaci ! First of all: thanks for making this package! Second, the reference to #30 - how should this patch relate to that? maybe a test? Third, I am not sure what is wrong with the coding style (I am not used to writing code that ships, just research prototypes.. :D)

[vlaci]

I think I understand the misunderstanding about the original faulty PR.