mod_smacks: Fix some bugs with smacks-ack-delayed event triggering. The old code had several flaws which are addressed here. First of all this fixes the if statement guarding the event generation There where some timing glitches addressed by this commit as well.

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summary: Allow server administrators to probe any user
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This module lets server administrators send `<presence type="probe"/>`
to any local user and receive their presence in response, bypassing
roster checks.