Remove leading dollar sign in rcvar command output.

There's no dollar use in variable assignment in sh.
Assuming this is can be expected behavior for some
people, this change won't be MFC'ed to RELENG_6.

Discussed with:	yar on -rc

etc/rc.subr

@@ -808,9 +808,9 @@ $command $rc_flags $command_args"
 			echo "# $name"
 			if [ -n "$rcvar" ]; then
 				if checkyesno ${rcvar}; then
-					echo "\$${rcvar}=YES"
+					echo "${rcvar}=YES"
 				else
-					echo "\$${rcvar}=NO"
+					echo "${rcvar}=NO"
 				fi
 			fi
 			;;