richedit: Made sure the caret position is stored when moving up/down

[Dylan Smith]

The caret's x position should be stored in ME_TextEditor.nUDArrowX so
that when the caret is moved up or down, it will stay along the same
horizontal position, or at the end of a line.  Moving past a blank line
will show the bug, because the cursor will stay to the left side on
further up/down movements.

This patch fixes this issue.
---
 dlls/riched20/caret.c  |    1 -
 dlls/riched20/editor.c |    9 +++++++--
 2 files changed, 7 insertions(+), 3 deletions(-)
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