richedit: Mask window id on WM_COMMAND notifications.

[Dylan Smith]

I have gotten window ids that are greater than 0xFFFF, and this caused
the notification messages sent through a WM_COMMAND to be modified since
the notification type is stored in the high word of wParam and the
window id in the low word of wParam.
---
 dlls/riched20/editor.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
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