ユーザー個別ページ、一覧ページのカウント数一覧で用いるメソッドをsizeに統一

統一するメソッドは実行効率の観点からsizeとした。

app/views/users/_activity_counts.html.slim

@@ -5,34 +5,34 @@
         dt.card-counts__item-label
           | 日報
         dd.card-counts__item-value
-          = link_or_text_for_count(user.reports.count, user_reports_path(user))
+          = link_or_text_for_count(user.reports.size, user_reports_path(user))
     .card-counts__item
       .card-counts__item-inner
         dt.card-counts__item-label
           | 提出物
         dd.card-counts__item-value
-          = link_or_text_for_count(user.products.count, user_products_path(user))
+          = link_or_text_for_count(user.products.size, user_products_path(user))
     .card-counts__item
       .card-counts__item-inner
         dt.card-counts__item-label
           | コメント
         dd.card-counts__item-value
-          = link_or_text_for_count(user.comments.count, user_comments_path(user))
+          = link_or_text_for_count(user.comments.size, user_comments_path(user))
     .card-counts__item
       .card-counts__item-inner
         dt.card-counts__item-label
           | 質問
         dd.card-counts__item-value
-          = link_or_text_for_count(user.questions.count, user_questions_path(user))
+          = link_or_text_for_count(user.questions.size, user_questions_path(user))
     .card-counts__item
       .card-counts__item-inner
         dt.card-counts__item-label
           | 回答
         dd.card-counts__item-value
-          = link_or_text_for_count(user.answers.count, user_answers_path(user))
+          = link_or_text_for_count(user.answers.size, user_answers_path(user))
     .card-counts__item
       .card-counts__item-inner
         dt.card-counts__item-label
           | ポートフォリオ
         dd.card-counts__item-value
-          = link_or_text_for_count(user.works.count, user_portfolio_path(user))
+          = link_or_text_for_count(user.works.size, user_portfolio_path(user))