make: install disables the service

We don't want the service to start automatically, because we can't ensure
that when it will run that the video device (/dev/video0) will be created.

What we want is for `udev` to be able to run the service on-demand.

Makefile

@@ -55,7 +55,7 @@ install:
 
 	$(SAY) "Loading the systemd service"
 	sudo systemctl daemon-reload
-	sudo systemctl enable fix-Logitech-HD-Pro-Webcam-C920.service 
+	sudo systemctl disable fix-Logitech-HD-Pro-Webcam-C920.service
 
 
 .PHONY: uninstall