pop3.c: Removed unnecessary POP3_STOP state changes

Removed unnecessary state changes in pop3_state_starttls_resp()
following previous fix in IMAP module.
diff --git a/lib/pop3.c b/lib/pop3.c
index f412c39..1972d63 100644
--- a/lib/pop3.c
+++ b/lib/pop3.c
@@ -562,7 +562,6 @@
     if(data->set.use_ssl != CURLUSESSL_TRY) {
       failf(data, "STARTTLS denied. %c", pop3code);
       result = CURLE_USE_SSL_FAILED;
-      state(conn, POP3_STOP);
     }
     else
       result = pop3_state_capa(conn);
@@ -574,10 +573,6 @@
       pop3_to_pop3s(conn);
       result = pop3_state_capa(conn);
     }
-    else {
-      /* End of connect phase */
-      state(conn, POP3_STOP);
-    }
   }
 
   return result;