Update splittest/teensy_2 to use SPLIT_USB_DETECT (#7028)

keyboards/handwired/splittest/teensy_2/config.h

@@ -27,5 +27,7 @@
 /* ws2812 RGB LED */
 #define RGB_DI_PIN D3
 
+// teensy has vbus detection issues - use usb detection instead
+#define SPLIT_USB_DETECT
 // required for teensy slave otherwise it "locks up" during startup
 #define NO_USB_STARTUP_CHECK

keyboards/handwired/splittest/teensy_2/teensy_2.c

@@ -1,14 +0,0 @@
-#include QMK_KEYBOARD_H
-
-bool is_keyboard_master(void) {
-    // TODO: replace this override once USB host detection is implemented
-    // SPLIT_HAND_PIN Combined with MASTER_LEFT or MASTER_RIGHT, gives a crude
-    // way to force teensy to run as slave/master
-    setPinInput(SPLIT_HAND_PIN);
-
-#if defined(MASTER_RIGHT)
-    return !readPin(SPLIT_HAND_PIN);
-#else
-    return readPin(SPLIT_HAND_PIN);
-#endif
-}