fix: set connectivity status to "connected" during fake idle

Set connectivity status to "connected" at the end of connect() call.
Otherwise for servers that do not support IMAP IDLE
connect() is called at the beginning of fake idle
and connectivity stays in "connecting" status most of the time.

src/imap.rs

@@ -391,6 +391,7 @@ impl Imap {
                     "IMAP-LOGIN as {}",
                     self.config.lp.user
                 )));
+                self.connectivity.set_connected(context).await;
                 info!(context, "Successfully logged into IMAP server");
                 Ok(())
             }