Fix functions with empty params (#19647)

* Fix functions with empty params

* Found a bunch more

keyboards/wilba_tech/wt65_xt/keymaps/zunger/keymap.c

@@ -435,7 +435,7 @@ void toggle_os_mode(void) {
   set_os_mode((os_mode + 1) % _OS_MODES_MAX);
 }
 
-void keyboard_post_init_user() {
+void keyboard_post_init_user(void) {
   set_os_mode(_WINDOWS);
 }
 

keyboards/wilba_tech/wt70_jb/wt70_jb.c

@@ -49,7 +49,7 @@ void via_init_kb(void)
     }
 }
 
-void keyboard_post_init_kb() {
+void keyboard_post_init_kb(void) {
     // This is a workaround to ensure "EEPROM cleared" PCBs will
     // start with the RGB test mode, essential for testing LEDs.
     if ( g_first_execution ) {