js: allow selection of multiple clients in scopes sidebar

Allow the selection of multiple client checkboxes if they belong
to the same room.
Each checkbox input in the DOM has a "data-parent-room" attribute
whose value is the value of the "name" attribute of its parent
room scope component.
To check if a checkbox is a client and a sibling of the one being
checked we check if "data-parent-room" is available for both nodes
and if they have the same value.

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