change [init] to [i]

This change was introduced in pull #1461. This fixes some missed
occurrences.

ROMFS/px4fmu_common/init.d/rc.io

@@ -16,5 +16,5 @@ then
 	set PX4IO_LIMIT 200
 fi
 
-echo "[init] Set PX4IO update rate limit: $PX4IO_LIMIT Hz"
+echo "[i] Set PX4IO update rate limit: $PX4IO_LIMIT Hz"
 px4io limit $PX4IO_LIMIT

ROMFS/px4fmu_common/init.d/rc.sensors

@@ -56,7 +56,7 @@ fi
 
 if meas_airspeed start
 then
-	echo "[init] Using MEAS airspeed sensor"
+	echo "[i] Using MEAS airspeed sensor"
 else
 	if ets_airspeed start
 	then

ROMFS/px4fmu_common/init.d/rc.uavcan

@@ -10,9 +10,9 @@ then
 		# First sensor publisher to initialize takes lowest instance ID
 		# This delay ensures that UAVCAN-interfaced sensors would be allocated on lowest instance IDs
 		sleep 1
-		echo "[init] UAVCAN started"
+		echo "[i] UAVCAN started"
 	else
-		echo "[init] ERROR: Could not start UAVCAN"
+		echo "[i] ERROR: Could not start UAVCAN"
 		tone_alarm $TUNE_ERR
 	fi
 fi