[Keyboard] Fix suihankey/split

keyboards/kakunpc/suihankey/split/rules.mk

@@ -1,4 +1,4 @@
 OLED_ENABLE = no
 SPLIT_KEYBOARD = yes
 
-DEFAULT_FOLDER = suihankey/split/rev1
+DEFAULT_FOLDER = kakunpc/suihankey/split/rev1