FIX: Unnecessary flash writes by ModbusSwitch component (#3648)

esphome/components/modbus_controller/switch/modbus_switch.cpp

@@ -6,11 +6,7 @@ namespace modbus_controller {
 
 static const char *const TAG = "modbus_controller.switch";
 
-void ModbusSwitch::setup() {
-  // value isn't required
-  // without it we crash on save
-  this->get_initial_state();
-}
+void ModbusSwitch::setup() {}
 void ModbusSwitch::dump_config() { LOG_SWITCH(TAG, "Modbus Controller Switch", this); }
 
 void ModbusSwitch::parse_and_publish(const std::vector<uint8_t> &data) {