[BUG] Disconnected dimmers not removed from HomeKit

[johannrichard]

Describe the bug
If an output/dimmer of a dingz has been visible in HomeKit and is subsequently set to not_connected(implemented via #114), it will not disappear from HomeKit.

To Reproduce

1. Addd dingz to HomeKit with at least one Dimmer enabled
2. Once it is running, remove the Dimmer in dingz by setting it to not_connected in the UI
3. The Dimmer will remain in HomeKit and even survive the restart of HomeBridge

Expected behavior
A Dimmer that is set to not_connected shall be removed from HomeKit (similar to the input / output switch handling)

Plugin environment (please complete the following information):

• dingz/myStrom Device Firmware Version 1.2.x
• Plugin Version: 1.8.0
• Node.js Version 14.14.0
• Homebridge Version 1.1.6

For inspiration, this is what needs to be done if an output is set to not_connected:

homebridge-dingz/src/dingzAccessory.ts

Lines 1224 to 1231 in 16c13f5

	if (
	this.accessory.getServiceById(this.platform.Service.Lightbulb, 'D1')
	) {
	this.platform.log.warn(
	'Input active. Dimmer Service 0 can not exist -> remove',
	);
	this.removeDimmerService('D1');
	}