[binary_sensor] initial state refactor (#8648)

Co-authored-by: Zsombor Welker <flaktack@welker.hu>

esphome/components/binary_sensor/binary_sensor.h

@@ -67,7 +67,7 @@ class BinarySensor : public EntityBase, public EntityBase_DeviceClass {
 
   // ========== INTERNAL METHODS ==========
   // (In most use cases you won't need these)
-  void send_state_internal(bool state, bool is_initial);
+  void send_state_internal(bool state);
 
   /// Return whether this binary sensor has outputted a state.
   virtual bool has_state() const;