offboard: fix typo, update proto #3430

Job	Run time
alpine 3.16.0 (musl)	8m 13s
coverage (ubuntu-20.04)	5m 37s
ubuntu-20.04 (package, non-mavsdk_server)	6m 31s
Ubuntu/Debian packaging (Ubuntu 20.04)	8m 23s
ubuntu-22.04 (package, non-mavsdk_server)	8m 7s
android-arm	7m 7s
linux-armv6	5m 34s
linux-armv7	4m 32s
linux-armv6-musl	8m 21s
ios	8m 19s
linux-arm64	5m 36s
linux-armv7l-musl	8m 24s
ios_simulator	6m 52s
linux-arm64-musl	8m 22s
android-arm64	6m 15s
macOS	8m 20s
ubuntu-20.04 (mavsdk, hunter)	2m 44s
ubuntu-22.04 (check style and docs)	2m 44s
macOS-framework	1m 16s
android-x86	6m 27s
android-x86_64	6m 13s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	2m 10s
ubuntu-22.04 (proto check)	1m 20s
ubuntu-20.04 (mavsdk_server, superbuild)	2m 4s
Windows	1m 44s
ubuntu-22.04 (mavsdk_server, superbuild)	1m 48s
iOS XCFramework	1s
	2h 23m 4s

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