Fix create identity error with pure digital account

ssk-wh requested to merge juchengshi/polkit:master into master

If it is a pure digital account, for example, unix-user: 1234567, the username after unix-user: will be parsed as uid, but in fact this is just the username

Can you tell me if this modification is correct? I don't know much about the polkit project,thanks!

Edited by ssk-wh

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