* gui: Make ID read-only and hide nearby devices when adding pending devices (fixes#8083)
Currently, there is no distinction between adding "new" and "pending"
devices. For this reason, the user is always presented with a list of
"nearby devices" to choose from. This commit adds such distinction to
the code, and in the case of "pending" device, both the device ID is
made read-only and the nearby devices list is hidden.
As a by-product of the function rename and clean-up, this commit also
hides the non-functional "remove" button that is shown when editing
device defaults.
Signed-off-by: Tomasz Wilczyński <twilczynski@naver.com>
