Fix double-encoding typo

Author: SteveSandersonMS

src/Microsoft.AspNetCore.NodeServices/Content/Node/entrypoint-http.js

@@ -83,7 +83,7 @@
 	                        return;
 	                    }
 	                    res.setHeader('Content-Type', 'application/json');
-	                    res.end(JSON.stringify(successValueJson));
+	                    res.end(successValueJson);
 	                }
 	                else {
 	                    // String - can bypass JSON-serialization altogether

src/Microsoft.AspNetCore.NodeServices/TypeScript/HttpNodeInstanceEntryPoint.ts

@@ -29,7 +29,7 @@ const server = http.createServer((req, res) => {
                         return;
                     }
                     res.setHeader('Content-Type', 'application/json');
-                    res.end(JSON.stringify(successValueJson));
+                    res.end(successValueJson);
                 } else {
                     // String - can bypass JSON-serialization altogether
                     res.setHeader('Content-Type', 'text/plain');