richedit: Removed some unused code

[Dylan Smith]

The ME_InvalidateFromOfs and ME_QueueInvalidateFromCursor methods are
never called, and the nInvalidOfs variable had its value set but never
used.

At first I was going to fix the code because editor->rcFormat is not
used properly in many places, but this code doesn't seem like it will be
needed, so it is better to just remove it.
---
 dlls/riched20/editor.c  |    1 -
 dlls/riched20/editor.h  |    1 -
 dlls/riched20/editstr.h |    1 -
 dlls/riched20/paint.c   |   25 -------------------------
 4 files changed, 0 insertions(+), 28 deletions(-)
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