monaco_editor: configure typescript for Latest target

This affects the diagnostics and completions when editing javascript
code in the editor.

bt5/erp5_monaco_editor/SkinTemplateItem/portal_skins/erp5_monaco_editor/monaco-editor.gadget.js.js

@@ -177,7 +177,7 @@
           });
 
           monaco.languages.typescript.javascriptDefaults.setCompilerOptions({
-            target: monaco.languages.typescript.ScriptTarget.ES6,
+            target: monaco.languages.typescript.ScriptTarget.Latest,
             allowNonTsExtensions: true,
             checkJs: true,
             allowJs: true,

bt5/erp5_monaco_editor/SkinTemplateItem/portal_skins/erp5_monaco_editor/monaco_editor_support.zpt

@@ -194,7 +194,7 @@ $script.onload = function() {
     noSyntaxValidation: false
   });
   monaco.languages.typescript.javascriptDefaults.setCompilerOptions({
-    target: monaco.languages.typescript.ScriptTarget.ES6,
+    target: monaco.languages.typescript.ScriptTarget.Latest,
     allowNonTsExtensions: true,
     checkJs: true,
     allowJs: true,