allow more variables

Author: dchapkine

res/koa/views/script-vars.html

@@ -5,7 +5,7 @@
   function addVar() {
     let nexLine = document.createElement("div");
     let id = document.getElementsByClassName("script-var").length;
-    if (id < 5) {
+    if (id < 20) {
       nexLine.innerHTML = `
       <div id="script-var-${id}" class="input-group script-var">
         <div class="input-group-prepend">