Do not copy warnings into helm-pass

[matthew-piziak]

For example, lets say that gpg versions are slightly mismatched:

gpg: WARNING: server 'gpg-agent' is older than us (2.2.13 < 2.2.17)

If you do the following…

~ $ pass generate HelmPassTest
The generated password for HelmPassTest is:
r(pb0,v%S(?kT3@JMaKFuBW#.
~ $ pass HelmPassTest
gpg: WARNING: server 'gpg-agent' is older than us (2.2.13 < 2.2.17)
r(pb0,v%S(?kT3@JMaKFuBW#.

…and then query HelmPassTest with helm-pass, the kill ring will now contain gpg: WARNING: server 'gpg-agent' is older than us (2.2.13 < 2.2.17), not r(pb0,v%S(?kT3@JMaKFuBW#..

[Ambrevar]

Helm-Pass does not interact with `pass` or `gpg` directly, instead it relies on the `password-store.el` package provided by the `password-store` project. The issue should be tracked starting from the `password-store-copy' function I believe. Can you report the issue upstream? They have a mailing list there: https://lists.zx2c4.com/mailman/listinfo/password-store There are also on IRC (`#pass` on Freenode).