Fix udp_bind > bind error in config examples. (#49)

Co-authored-by: Alexis DEVLEESCHAUWER <a.devleeschauwer@pyres.com>

Fixes #48.

Author: devleesch001

packaging/debian/chirpstack-mqtt-forwarder.toml

@@ -9,7 +9,7 @@
   enabled="semtech_udp" 
 
   [backend.semtech_udp]
-    udp_bind="0.0.0.0:1700"
+    bind="0.0.0.0:1700"
 
 [mqtt]
   topic_prefix="eu868"

packaging/vendor/dragino/mips_24kc/files/chirpstack-mqtt-forwarder.toml

@@ -9,7 +9,7 @@
   enabled="semtech_udp" 
 
   [backend.semtech_udp]
-    udp_bind="0.0.0.0:1700"
+    bind="0.0.0.0:1700"
 
 [mqtt]
   topic_prefix="eu868"

packaging/vendor/rak/mipsel_24kc/files/chirpstack-mqtt-forwarder.toml

@@ -9,7 +9,7 @@
   enabled="semtech_udp" 
 
   [backend.semtech_udp]
-    udp_bind="0.0.0.0:1700"
+    bind="0.0.0.0:1700"
 
 [mqtt]
   topic_prefix="eu868"

packaging/vendor/tektelic/kona/files/chirpstack-mqtt-forwarder.toml

@@ -9,7 +9,7 @@
   enabled="semtech_udp" 
 
   [backend.semtech_udp]
-    udp_bind="0.0.0.0:1700"
+    bind="0.0.0.0:1700"
 
 [mqtt]
   topic_prefix="eu868"