Replace some instances of Current.account with model account

app/models/board/entropic.rb

@@ -7,7 +7,7 @@ module Board::Entropic
   end
 
   def entropy
-    super || Current.account.entropy
+    super || account.entropy
   end
 
   def auto_postpone_period=(new_value)

app/models/card/promptable.rb

@@ -24,7 +24,7 @@ module Card::Promptable
       * Board id: #{board_id}
       * Board name: #{board.name}
       * Number of comments: #{comments.count}
-      * Path: #{card_path(self, script_name: Current.account.slug)}
+      * Path: #{card_path(self, script_name: account.slug)}
 
       END OF CARD #{id}
     PROMPT

app/models/comment/promptable.rb

@@ -20,7 +20,7 @@ module Comment::Promptable
         * Card title: #{card.title}
         * Created by: #{creator.name}}
         * Created at: #{created_at}}
-        * Path: #{card_path(card, anchor: ActionView::RecordIdentifier.dom_id(self), script_name: Current.account.slug)}
+        * Path: #{card_path(card, anchor: ActionView::RecordIdentifier.dom_id(self), script_name: account.slug)}
         END OF COMMENT #{id}
       PROMPT
   end

app/models/webhook.rb

@@ -49,8 +49,7 @@ class Webhook < ApplicationRecord
   end
 
   def renderer
-    # TODO:PLANB: Current.account is not quite right, we should use the webhook's account_id
-    @renderer ||= ApplicationController.renderer.new(script_name: "/#{Current.account.external_account_id}", https: !Rails.env.local?)
+    @renderer ||= ApplicationController.renderer.new(script_name: "/#{account.external_account_id}", https: !Rails.env.local?)
   end
 
   def for_basecamp?