use render for toast and remove helper function

app/helpers/application_helper.rb

@@ -148,36 +148,6 @@ module ApplicationHelper
     end
   end
 
-  def toast_bootstrap_flash
-    flash_messages = []
-    flash.each do |type, message|
-      type = 'success' if type == 'notice'
-      type = 'error'   if type == 'alert'
-      text = "<script>
-          toastr.options = {
-            'closeButton': false,
-            'debug': false,
-            'newestOnTop': false,
-            'progressBar': true,
-            'positionClass': 'toast-bottom-center',
-            'preventDuplicates': true,
-            'onclick': null,
-            'showDuration': '300',
-            'hideDuration': '100',
-            'timeOut': '5000',
-            'extendedTimeOut': '1000',
-            'showEasing': 'swing',
-            'hideEasing': 'linear',
-            'showMethod': 'fadeIn',
-            'hideMethod': 'fadeOut'
-          };
-          toastr.#{type}('#{message}');
-      </script>"
-      flash_messages << text.html_safe if message
-    end
-    flash_messages.join("\n").html_safe
-  end
-
   def label_for(event_state)
     result = ''
     case event_state