Set default dose sequence for flu to 1

Jira-Issue: MAV-1502

Author: misaka

app/models/programme.rb

@@ -103,7 +103,7 @@ def vaccinated_dose_sequence
   end
 
   def default_dose_sequence
-    hpv? ? vaccinated_dose_sequence : nil
+    hpv? || flu? ? vaccinated_dose_sequence : nil
   end
 
   def maximum_dose_sequence

spec/lib/reports/offline_session_exporter_spec.rb

@@ -955,7 +955,7 @@ def validation_formula(worksheet:, column_name:, row: 1)
   context "Flu programme" do
     let(:programme) { create(:programme, :flu) }
     let(:expected_programme) { "Flu" }
-    let(:expected_dose_sequence) { nil }
+    let(:expected_dose_sequence) { 1 }
 
     include_examples "generates a report"
   end

spec/models/immunisation_import_row_spec.rb

@@ -1179,7 +1179,8 @@
             "DATE_OF_VACCINATION" => session.dates.first.strftime("%Y%m%d"),
             "SESSION_ID" => session.id.to_s,
             "ORGANISATION_CODE" => organisation.ods_code,
-            "PERFORMING_PROFESSIONAL_EMAIL" => create(:user).email
+            "PERFORMING_PROFESSIONAL_EMAIL" => create(:user).email,
+            "DOSE_SEQUENCE" => "1"
           )
         end
 

spec/models/programme_spec.rb

@@ -160,7 +160,7 @@
     context "with a Flu programme" do
       let(:programme) { build(:programme, :flu) }
 
-      it { should be_nil }
+      it { should eq(1) }
     end
 
     context "with an HPV programme" do