Fix printing of {{{raw}}} handlebars expressions (#4535)

Previously, `{{{raw}}}` would be output as `{{raw}}`.

src/language-handlebars/printer-glimmer.js

@@ -148,10 +148,10 @@ function print(path, options, print) {
       const isConcat = pp && pp.type === "ConcatStatement";
       return group(
         concat([
-          /*n.escaped ? "{{{" : */ "{{",
+          n.escaped === false ? "{{{" : "{{",
           printPathParams(path, print),
           isConcat ? "" : softline,
-          /*.escaped ? "}}}" :*/ "}}"
+          n.escaped === false ? "}}}" : "}}"
         ])
       );
     }

tests/html_handlebars/__snapshots__/jsfmt.spec.js.snap

@@ -132,3 +132,11 @@ exports[`nested-path.hbs 1`] = `
   </div>
 </div>
 `;
+
+exports[`raw.hbs 1`] = `
+<p>{{{raw}}}</p>
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+<p>
+  {{{raw}}}
+</p>
+`;

tests/html_handlebars/raw.hbs

@@ -0,0 +1 @@
+<p>{{{raw}}}</p>