FIX: merge votes regardless of voters' visibility

[renato]

Ensures merging topics also merge votes regardless of the voters' visibility (when voting_show_who_voted site setting is false), bypassing this check from the previously used orig.who_voted:

discourse-topic-voting/lib/discourse_topic_voting/topic_extension.rb

Lines 48 to 52 in f9654ee

	def who_voted
	return if !SiteSetting.voting_show_who_voted
	self.votes.map(&:user)