Minor patch: LuaUI error reporting

[eriatarka]

This is just a tiny thing: when LuaUI encountered a script error which was reported via Script.Kill during startup, this would not be properly reported to the infolog. I fixed that. (KeyAutoBinder seems to have the same issue, but I didn't fix it there as of yet.)

Should be a no-brainer, so if someone could commit this for me, pretty please?