fix RC_CHANNELS_FUNCTION_MAX

msg/rc_channels.msg

@@ -1,4 +1,4 @@
-int32 RC_CHANNELS_FUNCTION_MAX=18
+int32 RC_CHANNELS_FUNCTION_MAX=19
 uint8 RC_CHANNELS_FUNCTION_THROTTLE=0
 uint8 RC_CHANNELS_FUNCTION_ROLL=1
 uint8 RC_CHANNELS_FUNCTION_PITCH=2
@@ -20,8 +20,8 @@ uint8 RC_CHANNELS_FUNCTION_PARAM_2=17
 uint8 RC_CHANNELS_FUNCTION_PARAM_3_5=18
 uint64 timestamp						# Timestamp in microseconds since boot time
 uint64 timestamp_last_valid					# Timestamp of last valid RC signal
-float32[18] channels						# Scaled to -1..1 (throttle: 0..1)
+float32[19] channels						# Scaled to -1..1 (throttle: 0..1)
 uint8 channel_count						# Number of valid channels
-int8[18] function						# Functions mapping
+int8[19] function						# Functions mapping
 uint8 rssi							# Receive signal strength index
 bool signal_lost						# Control signal lost, should be checked together with topic timeout