Change status when examine

[Ciran28]

When I tried to use the examine command, I found that the status was not updated.
So I modified the code accordingly, and that fixed the problem on my side.

[v1adimir-k]

+1
The "EXAMINE" command changes IMAP4 server state to "SELECTED", according to the protocol, so you can normally "fetch" an email, for example. In the lib, when the command executes with simple_command(), the state doesn't change, so when you try to fetch an email you get an error.