Change Devices/Bridges: Always allow to pair via QR-Code

[Apollon77]

The current logic is that we show a QR Code icon if the device is NOT commissioned yet and else the connect symbol with the list of connected controllers.

In fact we can also open a "Local commissioning window" anytime, so then people can scan in adapter UI for a second Ecosystem and do not need to get the code from it. For this we need to adjust the logic in UI a bit:

• Always show QR code and when clicking we send a backend call which returns the QR code data. Command could be "controllerAllowCommissioning" ... i then implement backend side
• When commissioned then show connection symbol, else not.