richedit: Fixed return value for WM_CHAR when the text is readonly.

[Dylan Smith]

I created a short test to check what was returned by WM_CHAR when the
ES_READONLY style was used since it was marked with a FIXME.

I found the constant from testing the return value from typing
different characters with the readonly style applied. I also checked
multiple version (v1.0, v3.0, and v4.1) to make sure they all
returned the same constant, and they all did.

I am still unsure of what the name of this constant or macro. MSDN
only states that 0 means the message was processed, but doesn't indicate
anything about what should be returned otherwise, so any non-zero number
would probably be suitable.
---
 dlls/riched20/editor.c       |    2 +-
 dlls/riched20/tests/editor.c |   24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+), 1 deletions(-)
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