richedit: Removed assumption about the order of rtf indent control words

[Dylan Smith]

Previously the calculations of dxStartIdent and dxOffset depended on
their order.

I removed this assumption, and made sure the calculations would be
correct independantly of one another.  The calculations are also correct
if one is missing, or if any either of them are repeated.
---
 dlls/riched20/editor.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)
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