Previously UI item's ids were duplicated,
the observed consequence is that any click on widgets
is catched by 1st declared element.

For example, a thing with 2 switches is displayed correctly,
and click events are also triggered
but event will be "redirected" to 1st switch only,
this is not desired.

The change is only fixing boolean widgets, others to come later.

Note: It was suggested to use nested inputs,
but unfortunately CSS can't traverse (to input)
and get back to parent (label), so "for" facility and id must be used.

Change-Id: I27ef75a95889c37224aa7da6b0fbf8e2ad57ba65
Bug: WebThingsIO#1148
Forwarded: WebThingsIO#1249
Origin: https://github.com/tizenteam/gateway
Signed-off-by: Philippe Coval <p.coval@samsung.com>