[Keyboard] Dimple: fix unintended LED behaviour (#6046)

* Dimple: fix unintended LED behaviour

The LED was always-on if the custom keymap did not call dimple_led_off()
at least once.

* Dimple: LED code fixup

keyboards/lazydesigners/dimple/dimple.c

@@ -16,9 +16,15 @@
 #include "dimple.h"
 
 void dimple_led_on() {
-  DDRE |= (1 << 6); PORTE &= ~(1 << 6);
+  writePinHigh(E6);
 }
 
 void dimple_led_off() {
-  DDRE &= ~(1 << 6); PORTE &= ~(1 << 6);
+  writePinLow(E6);
+}
+
+void keyboard_pre_init_kb(void) {
+  // Initialize Caps Lock LED
+  setPinOutput(E6);
+  keyboard_pre_init_user();
 }