MAYN-122

added the scrolling for the registration_code_generation modal dialog box.

lms/static/sass/course/instructor/_instructor_2.scss

@@ -1588,7 +1588,6 @@ input[name="subject"] {
       font-size: 12px;
       color: #646464
     }
-    top: 100px !important;
     width: 650px;
     @include margin-left(-325px);
     border-radius: 2px;

lms/templates/instructor/instructor_dashboard_2/e-commerce.html

@@ -223,7 +223,7 @@ import pytz
                    collapsible: true
                });
 
-     $('a[rel*=leanModal]').leanModal();
+     $('a[rel*=leanModal]').leanModal({ top : -70, position: "absolute", closeButton: ".modal_close" });
      $.each($("a.edit-right"), function () {
        if ($(this).parent().parent('tr').hasClass('inactive_coupon')) {
          $(this).removeAttr('href')