Specify `DEFAULT_FOLDER` for `v2/splinky` (#19093)

keyboards/bastardkb/charybdis/3x5/v2/splinky/rules.mk

@@ -35,3 +35,5 @@ POINTING_DEVICE_DRIVER = pmw3360
 
 SERIAL_DRIVER = vendor
 WS2812_DRIVER = vendor
+
+DEFAULT_FOLDER = bastardkb/charybdis/3x5/v2/splinky/v3

keyboards/bastardkb/charybdis/3x6/v2/splinky/rules.mk

@@ -35,3 +35,5 @@ POINTING_DEVICE_DRIVER = pmw3360
 
 SERIAL_DRIVER = vendor
 WS2812_DRIVER = vendor
+
+DEFAULT_FOLDER = bastardkb/charybdis/3x6/v2/splinky/v3

keyboards/bastardkb/charybdis/4x6/v2/splinky/rules.mk

@@ -34,3 +34,5 @@ POINTING_DEVICE_DRIVER = pmw3360
 
 SERIAL_DRIVER = vendor
 WS2812_DRIVER = vendor
+
+DEFAULT_FOLDER = bastardkb/charybdis/4x6/v2/splinky/v3

keyboards/bastardkb/scylla/v2/splinky/rules.mk

@@ -31,3 +31,5 @@ SPLIT_KEYBOARD = yes
 
 SERIAL_DRIVER = vendor
 WS2812_DRIVER = vendor
+
+DEFAULT_FOLDER = bastardkb/scylla/v2/splinky/v3

keyboards/bastardkb/skeletyl/v2/splinky/rules.mk

@@ -32,3 +32,5 @@ LAYOUTS = split_3x5_3
 
 SERIAL_DRIVER = vendor
 WS2812_DRIVER = vendor
+
+DEFAULT_FOLDER = bastardkb/skeletyl/v2/splinky/v3

keyboards/bastardkb/tbkmini/v2/splinky/rules.mk

@@ -32,3 +32,5 @@ LAYOUTS = split_3x6_3
 
 SERIAL_DRIVER = vendor
 WS2812_DRIVER = vendor
+
+DEFAULT_FOLDER = bastardkb/tbkmini/v2/splinky/v3