AP_Camera: fix video recording while armed #35706

Job	Run time
build (stm32f7, chibios, 10)	14m 30s
build (stm32h7, chibios, 10)	12m 50s
build (fmuv2-plane, chibios, 10)	5m 46s
build (periph-build, chibios, 10)	18m 56s
build (iofirmware, chibios, 10)	2m 28s
build (CubeOrange-bootloader, chibios, 10)	1m 16s
build (fmuv3-bootloader, chibios, 10)	1m 14s
build (revo-bootloader, chibios, 10)	1m 9s
build (stm32h7-debug, chibios, 10)	7m 10s
build (fmuv3, chibios, 10)	13m 31s
build (revo-mini, chibios, 10)	10m 42s
build (MatekF405-Wing, chibios, 10)	11m 13s
build (CubeOrange-ODID, chibios, 10)	8m 30s
build (CubeRedPrimary-bootloader, chibios, 10)	1m 27s
build (configure-all, chibios, 10)	9m 23s
build (build-options-defaults-test, chibios, 10)	19m 54s
build (signing, chibios, 10)	9m 39s
build (CubeOrange-PPP, chibios, 10)	6m 59s
build (CubeOrange-SOHW, chibios, 10)	7m 17s
build (Pixhawk6X-PPPGW, chibios, 10)	3m 26s
	2h 47m 20s

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