richedit: Fixed a bug in protecting table cell boundaries

[Dylan Smith]

This bug occurs when a selection is made from the start of a table row
to past the third (or greater) cell in the same table row.  In this case
the cell boundary should be found from the start rather than the end of
the selection, otherwise cell boundaries will be deleted.

This fixes a bug in a patch I recently sent:
300db3765ff64397beaf61f20e86408a7ccad258
richedit: Each cell can contain multiple paragraphs in msftedit
---
 dlls/riched20/table.c |   30 ++++++++----------------------
 1 files changed, 8 insertions(+), 22 deletions(-)
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