EKF2: allow sideslip fusion to always start with airspeed fusion #2519

Job	Run time
Scan for Board Targets	31s
Build Group [base-px4]	4m 47s
Build Group [nuttx-px4-0]	9m 3s
Build Group [nuttx-px4-1]	13m 38s
Build Group [nuttx-px4-2]	14m 6s
Build Group [nuttx-px4-3]	7m 1s
Build Group [nuttx-mro-0]	11m 17s
Build Group [nuttx-mro-1]	3m 4s
Build Group [nuttx-nxp-0]	11m 58s
Build Group [nuttx-nxp-1]	4m 13s
Build Group [nuttx-cubepilot]	9m 18s
Build Group [nuttx-cuav]	7m 31s
Build Group [nuttx-matek]	6m 32s
Build Group [nuttx-ark-0]	6m 33s
Build Group [nuttx-ark-1]	6m 0s
Build Group [nuttx-micoair]	5m 15s
Build Group [nuttx-holybro-0]	8m 16s
Build Group [nuttx-holybro-1]	4m 32s
Build Group [nuttx-0]	10m 4s
Build Group [nuttx-1]	9m 38s
Build Group [nuttx-2]	11m 18s
Build Group [nuttx-3]	3m 48s
Build Group [armhf-0]	4m 41s
Build Group [aarch64-0]	2m 35s
Create Release and Upload Artifacts	0s
Upload Artifacts to S3	0s
	2h 55m 39s

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