mod_rest: Revert leftover of unfinished ?query mapping Idea was to allow second level data fields to be passed as query parameters, i.e. /rest/command/{to}/?command=execute&node=foobar but that's still a work in progress, so reverted here for now.

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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.