mod_mam_archive: remove invalid disco#info feature The feature which was previously added to disco#info was in fact specified to be used for stream features only (see XEP-0136 section 11). Emitting it in disco#info is weird at best and breaks stuff at worst.

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labels:
- Statistics
summary: Collect statistics on user presences
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Description
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This module measures the number of resources of a certain show (available,
away, etc.) currently connected, and reports using Prosody 0.10 APIs