FIX: Query correct model in posts:inline_uploads (#18330)

Follow up to commit 9db8f00b3d.

lib/tasks/posts.rake

@@ -662,10 +662,7 @@ def correct_inline_uploads
   dry_run = (ENV["DRY_RUN"].nil? ? true : ENV["DRY_RUN"] != "false")
   verbose = ENV["VERBOSE"]
 
-  scope = Upload
-    .joins(:upload_references)
-    .where(upload_references: { target_type: 'Post' })
-    .distinct("posts.id")
+  scope = Post.joins(:upload_references).distinct("posts.id")
     .where(<<~SQL)
     raw LIKE '%/uploads/#{RailsMultisite::ConnectionManagement.current_db}/original/%'
     SQL