Move eboot_command_clear to after firmware copy. (#6823)
Move eboot_command_clear to after firmware copy. (#6823)

The eboot command was cleared from the rtc mem before the firmware copy
making it possible for a power failure during an OTA update to brick the
esp until the firmware was loaded via USB because of a partial firmware
copy that would never be restarted.

Moving the eboot_command_clear to after the copy ensures that any partial
copy is restarted at next power on.
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