richedit: Prevent crash on word selection at end of paragraph.

[Dylan Smith]

The bug can be tested by opening wordpad, type a character, press enter
to start a new paragraph, then double click at the end of the first
line/paragraph. This will crash wordpad because ME_MoveCursorWords set
the cursor to the wrong paragraph for the selected run when finding the
previous word over a paragraph boundary, so I fixed this by updating it
properly for this condition.
---
 dlls/riched20/caret.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
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