vendor.sh: fix bad cbfstool path

i overlooked this one in the previous commit

there is always one.

Signed-off-by: Leah Rowe <leah@libreboot.org>

include/vendor.sh

@@ -277,7 +277,7 @@ bootstrap()
 	fx_ "x_ ./mk -b" printf "uefitool\nbiosutilities\nbios_extract\n"
 	[ -d "${kbc1126_ec_dump%/*}" ] && x_ make -C "$cbdir/util/kbc1126"
 	[ -n "$MRC_refcode_cbtree" ] && \
-	    cbfstoolref="elf/cbfstool/$MRC_refcode_cbtree/cbfstool" && \
+	    cbfstoolref="elf/coreboot/$MRC_refcode_cbtree/cbfstool" && \
 	    x_ ./mk -d coreboot "$MRC_refcode_cbtree"; :
 }