Typo fix for Auto-Pause GUI.

This is a minor fix for auto-pause. You can use Auto-Pause to set a call ID.
Had decided not to use regex to check the user input for the call ID (which should be a hex number), I set up a check for input against the result that would be prepared to store into pause.bin.
But i made a mistake and it wasn't doing the check properly.
Sorry for not commit in time. @Hykem, i'm so sorry for this.