Few changes in test files for date(time)picker in order to make tests more readable

spec/support/features/datepicker_helper.rb

@@ -4,8 +4,7 @@ module Features
   module DatepickerHelper
     def choose_today_from_datepicker
       within(".flatpickr-calendar.open") do
-        # Now that we have added the Close button, find the first button to avoid any ambiguous match
-        find('.shortcut-buttons-flatpickr-buttons > button:nth-child(1)').click
+        find("button", text: "TODAY").click
       end
     end
 

spec/system/admin/order_cycles/list_spec.rb

@@ -161,7 +161,7 @@ describe '
         within(".flatpickr-calendar.open") do
           expect(page).to have_selector '.shortcut-buttons-flatpickr-buttons'
           select_datetime_from_datepicker test_value
-          find(".shortcut-buttons-flatpickr-buttons > button:nth-last-child(1)").click
+          find("button", text: "CLOSE").click
         end
 
         # Should no more have opened flatpickr

spec/system/flatpickr_spec.rb

@@ -7,23 +7,25 @@ describe "Test Flatpickr", js: true do
   include WebHelper
 
   context "orders" do
-    it "opens the datepicker and closes it using the last button (the 'Close' one)" do
+    it "opens the datepicker and closes it using the 'CLOSE' button" do
       login_as_admin_and_visit 'admin/orders'
       open_datepicker('#q_completed_at_gteq')       
       # Looks for the close button and click it
       within(".flatpickr-calendar.open") do
         expect(page).to have_selector '.shortcut-buttons-flatpickr-buttons'
-        find(".shortcut-buttons-flatpickr-buttons > button:nth-last-child(1)").click
+        find("button", text: "CLOSE").click
       end
       # Should no more have opened flatpickr
       expect(page).not_to have_selector '.flatpickr-calendar.open'
     end
+    
     it "opens the datepicker and sets date to today" do
       login_as_admin_and_visit 'admin/orders'
       open_datepicker('#q_completed_at_gteq')
       choose_today_from_datepicker
       check_fielddate('#q_completed_at_gteq', Date.today())       
     end
+    
     it "opens the datepicker and closes it by clicking outside" do
       login_as_admin_and_visit 'admin/orders'
       open_datepicker('#q_completed_at_gteq')
@@ -33,13 +35,15 @@ describe "Test Flatpickr", js: true do
     end
   end
   
-private
+  private
+  
   def open_datepicker(field)
     # Opens a datepicker
     find(field).click
     # Should have opened flatpickr
     expect(page).to have_selector '.flatpickr-calendar.open'
   end
+  
   def check_fielddate(field, date)
     # Check the value is correct
     expect(find(field, match: :first).value).to eq date.to_datetime.strftime("%Y-%m-%d")