EXT-4301 FIXED Now instance of the LLAvalineListItem is created with "hide phone number" = false.

Note: changes in the llparticipantlist.cpp is a fix of initial implementation in 79c0487c2280 changeset.
    "waiting" is shown instead of phone number.
It was not reproduced before because phone was not shown anywhere until this patch.

Reviewed by Aimee Walton at https://codereview.productengine.com/secondlife/r/729/

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branch : product-engine