richedit: Fix unicode truncation on EM_GETLINE message

[Dylan Smith]

On EM_GETLINE the number of characters to copy was being passed into
lstrcpyn for unicode strings, however lstrcpyn always makes sure the
string is null terminated.  This caused a NULL character to replace the
last character in the run, which caused a bug in the application I was
trying to fix (Bug 16349).

I simply used memcpy instead of lstrcpyn so that no NULL terminating
character is inserted unless there is extra space in the buffer.
---
 dlls/riched20/editor.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
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