recovery: do not update bootloader message for boot-fastboot

When booting to fastbootd using bootloader message:
boot.command=boot-fastboot, the boot command get overwritten to
boot-recovery by update_bootloader_message. If the daemon crash for
whatever reason before the bootloader message got clear, the daemon
would start in adb recovery mode instead of fastbootd after it
respawns. Only update bootloader message for boot-recovery command.

Bug: 332973437
Test: boot to fastbootd
Change-Id: I5747c62cf50d2347894d266f2665035f15ae5da0