Fix issue 546: Tab key not working in JS editor when using CodeMirror

- The check for the Emmet option was short-circuiting the logic for
inserting a Tab.  Note that the emmet option is only enabled on HTML and
CSS editors, (and not the JS editor), which is why the `Tab` key works in
those editors, but not the JS editor.

src/components/CodeEditor.jsx

@@ -344,6 +344,7 @@ export default class CodeEditor extends Component {
 							if (didEmmetWork === true) {
 								return;
 							}
+						}
 						const input = $('[data-setting=indentWith]:checked');
 						if (
 							!editor.somethingSelected() &&
@@ -356,7 +357,6 @@ export default class CodeEditor extends Component {
 						} else {
 							CodeMirror.commands.defaultTab(editor);
 						}
-						}
 					},
 					Enter: 'emmetInsertLineBreak'
 				}