The previous format for some reason was causing problems when wrapping
comments in files with ft=sh. This new pattern seems to fix the issue
while keeping the old functionality.
The reason for this is that in some servers the automatic detection (see
:help background) is guessing it wrong and using a light background,
consequently burning my eyeballs every time I open vim.
Hard coding the dark background seems fine for now, as I seem to never
really have a need for the light version. If the needs arises in the
future, then I'll have to come up with a better solution, but KISS for
now.
I actually don't have a use case for this at the moment and removing it
avoids running arbitrary vimscript unintentionally. I can always add it
back later if a real world use case arises...
