Bluetooth Pref: Updating view of incomming connection when Paring

This is not my code but from ticket #9265
* Made a picture of how it looks, old left andnew right. https://imagebin.ca/v/5wIe6TIMzw4C
* Think we have a bug somewhere and don't store the name of the Bluetooth device (shown i the image).
* I have made som small changes but other than that it's the same code as in the ticket
* Ran the src/tools/checkstyle/checkstyle.py to get som style stuff, probably missed some anyway.

Change-Id: Ifeb75c8ad890f541e100cdcf78b394675a48ada9
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3825
Reviewed-by: Fredrik Modéen <fredrik@modeen.se>