don't render non-empty dashing with zero-length phase

Adobe Reader and Microsoft XPS viewer differ in their handling of
non-empty dashed strokes where the phase is 0: Adobe Reader considers
these to be faulty and omits them while Microsoft XPS Viewer renders
them the same as an empty dash (i.e. solid).

This patch makes Fitz no longer render such strokes and ensures that
MuXPS never emits them so that the desired behavior results (this is
the easier implementation since XPS rendering code renders stroked
paths in a single location whereas PDF rendering does it all over the
place).

See https://code.google.com/p/sumatrapdf/issues/detail?id=2339 for a
testcase.

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