vncserver: extract AtLeastOneUserConfigured()

unix/vncserver

@@ -843,7 +843,7 @@ sub DisableVncAuth() {
 }
 
 sub TellUserToSetupUserAndPassword {
-   if (scalar @kasmPasswdUsers > 0) {
+   if (&AtLeastOneUserConfigured()) {
       return;
    }
 
@@ -854,6 +854,10 @@ sub TellUserToSetupUserAndPassword {
    }
 }
 
+sub AtLeastOneUserConfigured {
+   scalar @kasmPasswdUsers > 0;
+}
+
 sub LoadKasmPasswdUsers {
    my @result = ();