Fix error message when deleting and providing a non-GF replacement URL

Author: JasonBarnabe

app/controllers/scripts_controller.rb

@@ -481,14 +481,10 @@ def do_delete
     # Handle replaced by
     replaced_by = get_script_from_input(params[:replaced_by_script_id])
     case replaced_by
-    when :non_gf_url
+    when :non_gf_url, :non_script_url
       @script.errors.add(:replaced_by_script_id, I18n.t('errors.messages.must_be_greasy_fork_script', site_name:))
       render :delete
       return
-    when :non_script_url
-      @script.errors.add(:replaced_by_script_id, :must_be_greasy_fork_script)
-      render :delete
-      return
     when :not_found
       @script.errors.add(:replaced_by_script_id, :not_found)
       render :delete