Fix bug where we don't re-disable a button if they uncheck that the verification…

Fix bug where we don't re-disable a button if they uncheck that the verification pictures look good.

lms/templates/verify_student/photo_verification.html

@@ -135,6 +135,9 @@
       if (this.checked) {
         $("#pay_button_frame").removeClass('disabled');
       }
+      else {
+        $("#pay_button_frame").addClass('disabled');
+      }
     });
 
     $("#pay_button_frame").addClass('disabled');