Colloquy causes a join-flood if Applescript debugging is enabled at launch

[celticminstrel]

If the secret AppleScript debugging preference is enabled when Colloquy launches, I get a flood of AppleScript error boxes and Colloquy joins my auto-connect servers repeatedly. I think as many as six joins on a server has resulted from this.

Since there's usually no reason to have debug mode on when Colloquy launches, I propose a simple fix for this: turn the preference off when Colloquy quits.