Readd paid attribute for videos

src/invidious/videos.cr

@@ -301,6 +301,7 @@ struct Video
       json.field "likeCount", self.likes
       json.field "dislikeCount", self.dislikes
 
+      json.field "paid", self.paid
       json.field "premium", self.premium
       json.field "isFamilyFriendly", self.is_family_friendly
       json.field "allowedRegions", self.allowed_regions
@@ -688,6 +689,12 @@ struct Video
     items
   end
 
+  def paid
+    reason = info["playabilityStatus"]?.try &.["reason"]?
+    paid = reason == "This video requires payment to watch." ? true : false
+    paid
+  end
+
   def premium
     keywords.includes? "YouTube Red"
   end