wmlindent: fix pango indentation-stopping bug (pointed out by vultraz)

I had a hunch that the hash would be the problem, because I realized that wmllint usually just looked for '#' to figure out if a line contained a comment, and that this also matched pango color coding. My wmllint backslash/userdata commits used this same re.split match to prevent this false positive.

(It won't prevent all unintended matches, e.g. "Guard #4", but I don't think that can be helped.)

The problem came, I believe, when the old line interacted with the block ten lines down:

        elif eligible.count('"') % 2:
            dostrip = not dostrip

The value's closing quote was on the other side of the split.