Org reader: allow toggling header args

Org-mode allows to skip the argument of a code block header argument if
it's toggling a value.  Argument-less headers are now recognized,
avoiding weird parsing errors.

The fixes are not exactly pretty, but neither is the code that was
fixed.  So I guess it's about par for the course.  However, a rewrite of
the header parsing code wouldn't hurt in the long run.

Thanks to @jo-tham for filing the bug report.

This fixes #2269.

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