TMO50: use layer_state_set_kb at keyboard level (qmk#10150)

* Change TMO to use layer_state_set_kb as is customary at the keyboard level.

This also factors out `process_indicator_led` to a separate method.

keyboards/tmo50/tmo50.c

@@ -51,34 +51,51 @@ void led_set_kb(uint8_t usb_led) {
 	led_set_user(usb_led);
 }
 
-uint32_t layer_state_set_user(uint32_t state)
+layer_state_t layer_state_set_kb(layer_state_t state)
 {
-  // if on layer 0, turn on B0 LED, otherwise off.
-    if (biton32(state) == 0) {
+  state = layer_state_set_user(state);
+  process_indicator_led_kb(state);
+
+  return state;
+}
+
+__attribute__((weak))
+bool process_indicator_led_user(layer_state_t state){
+  return true;
+}
+
+bool process_indicator_led_kb(layer_state_t state)
+{
+  if(process_indicator_led_user(state))
+  {
+    // if on layer 0, turn on B0 LED, otherwise off.
+    if (get_highest_layer(state) == 0) {
         PORTB &= ~(1<<PB0);
     } else {
         PORTB |= (1<<PB0);
     }
 
-  // if on layer 1, turn on B1 LED, otherwise off.
-    if (biton32(state) == 1) {
+    // if on layer 1, turn on B1 LED, otherwise off.
+    if (get_highest_layer(state) == 1) {
         PORTB &= ~(1<<PB1);
     } else {
         PORTB |= (1<<PB1);
     }
-  // if on layer 2, turn on B2 LED, otherwise off.
-    if (biton32(state) == 2) {
+
+    // if on layer 2, turn on B2 LED, otherwise off.
+    if (get_highest_layer(state) == 2) {
         PORTB &= ~(1<<PB2);
     } else {
         PORTB |= (1<<PB2);
     }
 
-  // if on layer 3, turn on B3 LED, otherwise off.
-    if (biton32(state) == 3) {
+    // if on layer 3, turn on B3 LED, otherwise off.
+    if (get_highest_layer(state) == 3) {
         PORTB &= ~(1<<PB3);
     } else {
         PORTB |= (1<<PB3);
     }
+  }
 
-    return state;
+  return true;
 }

keyboards/tmo50/tmo50.h

@@ -17,6 +17,10 @@
 
 #include "quantum.h"
 
+bool process_indicator_led_kb(layer_state_t state);
+__attribute__((weak))
+bool process_indicator_led_user(layer_state_t state);
+
 /* This a shortcut to help you visually see your layout.
  *
  * The first section contains all of the arguments representing the physical
@@ -51,4 +55,3 @@
 	{ K20, K21, K22, K23, K24,   K25,   K26,   K27, K28,   K29,   K2A, K2B,   K2C,   K2D },   \
 	{ K30, K31, K32, K33, KC_NO, KC_NO, KC_NO, K37, KC_NO, KC_NO, K3A, KC_NO, KC_NO, KC_NO }  \
 }
-