Fix logic around newline folding/escaping, since test data was being escaped more than expected.

3x5.js

@@ -36,7 +36,7 @@ function renderCard(state, code) {
 let theCard = {
   id: 100,
   fields: {},
-  code: `
+  code: String.raw`
     h1 Hello, World!
     para [2 + 2]
     block {

notcl.js

@@ -15,7 +15,7 @@
 function parseNotcl(code) {
   /* Preprocess */
   // fold line endings
-  code = code.replace(/(?<!\\)(\\\\)*\\n/g, "$1");
+  code = code.replace(/(?<!\\)((\\\\)*)\\\n/g, "$1");
 
   /* Parse */
   function nextWord(/* TODO: null/] terminator */) {