https://gitlab.synchro.net/main/sbbs/-/commit/fbe51f3eec27287c29f058a1
Modified Files:
	src/sbbs3/writemsg.cpp
Log Message:
Fix off-by-one usage of snprintf() when copying message subject

- when converting from CP437 to UTF-8
- when reading from RESULT.ED drop file

This effectively limited message subjects in some instances to 69 chars
instead of 70. This bug was caught while debugging a replied-message subject
conversion from UTF-8 to CP437 issue reported by Accession.
--- SBBSecho 3.23-Linux