[openstreetmap/openstreetmap-website] count > 0 could be exists? (#1616)

[lelelelemon]

```

openstreetmap-website/app/controllers/relation_controller.rb:162:    relationids = RelationMember.where(:member_type => objtype, :member_id => params[:id]).collect(&:relation_id).uniq
--
openstreetmap-website/app/models/old_way.rb:58:    @nds \|\|= old_nodes.order(:sequence_id).collect(&:node_id)

```
We can change collect(:xx) to pluck(:xx) which is more efficient

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