Fix up default folder locations. (#16135)

keyboards/25keys/aleth42/rules.mk

@@ -1 +1 @@
-DEFAULT_FOLDER = aleth42/rev1
+DEFAULT_FOLDER = 25keys/aleth42/rev1

keyboards/maple_computing/ivy/rules.mk

@@ -17,4 +17,4 @@ BACKLIGHT_ENABLE = yes      # Enable keyboard backlight functionality
 AUDIO_ENABLE = no           # Audio output
 RGBLIGHT_ENABLE = no        # Enable WS2812 RGB underlight.
 
-DEFAULT_FOLDER = ivy/rev1
+DEFAULT_FOLDER = maple_computing/ivy/rev1