Fix #3365: Incorrect tag category counts.

`Hash[array]` didn't work because Hash needed to be called as `Hash[*array]`. Or,
more simply, `array.to_h`.

app/models/post.rb

@@ -626,7 +626,7 @@ class Post < ApplicationRecord
 
     def set_tag_counts
       self.tag_count = 0
-      TagCategory.categories {|x| set_tag_count(x,0)}
+      TagCategory.categories.each {|x| set_tag_count(x,0)}
       categories = Tag.categories_for(tag_array, :disable_caching => true)
       categories.each_value do |category|
         self.tag_count += 1

app/models/tag.rb

@@ -142,7 +142,7 @@ class Tag < ApplicationRecord
         Post.raw_tag_match(name).where("true /* Tag#update_category_post_counts */").find_each do |post|
           post.reload
           post.set_tag_counts
-          args = Hash[TagCategory.categories {|x| ["tag_count_#{x}",post.send("tag_count_#{x}")]}].update(:tag_count => post.tag_count)
+          args = TagCategory.categories.map {|x| ["tag_count_#{x}",post.send("tag_count_#{x}")]}.to_h.update(:tag_count => post.tag_count)
           Post.where(:id => post.id).update_all(args)
         end
       end