_schedule_invite_join already requires both is_direct and inviter before recording m.direct, so `is_direct and bool(inviter)` at the reconcile call site was redundant; pass is_direct through. The `if is_direct and not inviter` WARNING could only be reached with GATEWAY_ALLOW_ALL_USERS set and a spec-violating stripped m.room.member event lacking `sender`; the info log already prints is_direct, so drop the branch.
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