Allow missing BeaconInterval parameter in dmr config

[lx1ge]

HI,

Is it possible to add an the possibility to the dashboard to remove the "BeaconInterval" paramter in the mmdvm config (dmr part)?
Currently I need to remove it manually in the config file and it reappears after doing a change in the dashboard. I am not yet sure if it also reappears after an update.
This is needed so the the dmr beacons get send based on a network event rather than time based: g4klx/MMDVMHost#529 (comment)

with BeaconInterval=60 set in the mmdvm config:

I: 2021-05-16 06:55:47.546 DMR Roaming Beacons Type: timed
I: 2021-05-16 06:55:47.546 DMR Roaming Beacons Interval: 60s
I: 2021-05-16 06:55:47.546 DMR Roaming Beacons Duration: 3s

with BeaconInterval missing:

I: 2021-05-16 07:01:11.517 DMR Roaming Beacons Type: network
I: 2021-05-16 07:01:11.517 DMR Roaming Beacons Duration: 3s

73, LX1GE