trees: fix bad comparison

pro-tip: don't do this at 3AM

do massive changes like this, no later than 1AM.

the intent anyway is for -d to cause no build dependencies
to be handled, but the current logic says to only handle
them if -d is set! fix it by removing the ! part

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

script/trees

@@ -162,7 +162,7 @@ configure_project()
 	[ "$XBMK_RELEASE" = "y" ] && [ "$release" = "n" ] && return 1
 	[ -z "$btype" ] || [ "${mode%config}" = "$mode" ] || return 1
 
-	if [ "$_f" != "-d" ]; then
+	if [ "$_f" = "-d" ]; then
 		:
 	elif [ -z "$mode" ]; then
 		for bd in $build_depend; do