[dev] Scry last poll block optimisation

[Duck]

Now that we can limit how many polls to fetch, we don't neet to get all polls 
data to select the last one. The patch limit the retriving to the first 
retuned poll.

Then as we select the poll in the title of the block. We can "cache" the poll 
data in "this->_poll" so we can reuse id later in the _content block call.


Duck
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