fix sending form on submit,

sample_prep_protocol.html

@@ -96,6 +96,7 @@
 
 
   function add(event){
+
     let prep_protocol = {
       "name" : document.getElementById("name").value,
       "Sample_Size" : document.getElementById("Sample_Size").value,
@@ -115,8 +116,6 @@
       // Don't forget to handle errors!
     };
     event.preventDefault();
-
-    return false;
   }