fix clear USER_FLAG_ALLCOMMANDS flag in acl
fix clear USER_FLAG_ALLCOMMANDS flag in acl

in ACLSetUserCommandBit, when the command bit overflows, no operation
is performed, so no need clear the USER_FLAG_ALLCOMMANDS flag.

in ACLSetUser, when adding subcommand, we don't need to call
ACLGetCommandID ahead since subcommand may be empty.

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