remove unuse variable and comment

vendor/built_in_modules/survey/app/controllers/panel/survey/back_end/surveys_controller.rb

@@ -104,12 +104,6 @@ class Panel::Survey::BackEnd::SurveysController < OrbitBackendController
     end
 
     @start_row = 2
-    @header = @spreadsheet.row(1)
-
-    # (2..@spreadsheet.last_row).each do |i|
-    #   parse each row here 
-    # end
-
     @survey.survey_answers.destroy
     @survey_questions.each_with_index do |question,index|
       case question.type