Update chirpstack-udp-forwarder.sh

[g6094199]

add loglevel for later loglevel gui enhancement.

[brocaar]

But this doesn't change anything does it? The default is already INFO, so the behavior will be exactly the same. I'm happy to review a PR to add log-level configuration to the UI (might be helpful to add to all ChirpStack packages in that case).

[g6094199]

jep u r right. my intention is to add it to the gui. but i have to figure it out on every singel probgram. it does slightly vary sometimes.