Modify algorithm to toggle inverse command along with bright command

Modify algorithm to toggle inverse command along with bright command

Rxvt interprets the 'inverse' ANSI command (7m) in a strange way: when
the ANSI 'bright' command (1m) is provided, the provided ansi foreground
and background colours are swapped as expected; when 'bright' is not
provided, the DEFAULT foreground and background colours are swapped, and
the provided colours are ignored. Leaving out 'inverse' when 'bright' is
not used produces expected results.