Fix escape sequence for bold text

"\e[1;m" is interpreted as:

	- "1" = activate bold text
	- ";" = separator between parameters
	- "m" = end of sequence -- but the last thing we saw was a ";",
	  so technically this is the empty parameter which means "reset"

Final result: The terminal activates bold text and then resets all
attributes -- including "bold". :-)

This is very likely not to show up on all terminals. On XTerm and the
Linux VT, it does.