https://gitlab.synchro.net/main/sbbs/-/commit/7b3873e5adaab2542137e602
Modified Files:
	src/sbbs3/getkey.cpp str_util.c str_util.h
Log Message:
Fix mnemonics bug introduced in commit b84c583a26e6f

We want to not expand tilde to attributes when there are any attribute codes
in the mnemonics string. The existene of a non-attribute ctrl-a code should
not have prevented the tilde expansion.

Fix for issue #805 reported by Nelgin (thank you)
--- SBBSecho 3.20-Linux