Fixing odd indentation levels in syntax file

For some reason a whole group of regexes where indented 2 space.  Not
sure why, perhaps a holdover from some other era of whitespace
organization.  Anyays, pulling it back for now.  This is a purely
aesthetic/cleanup commit, nothing major.
Merge pull request #171 from pangloss/useless-whitespace

Fixing odd indentation levels in syntax file