fix: enable line wrapping in codemirror plugin

This solves the issue described in
[LPS-120594](https://issues.liferay.com/browse/LPS-120549), where
occasionally the editor's source mode now handled by the "codemirror"
plugin grows depending on the text that is in the editor.

plugins/codemirror/plugin.js

@@ -19,6 +19,7 @@
 					textarea.$,
 					{
 						lineNumbers: true,
+						lineWrapping: true,
 						mode: 'text/html',
 					}
 				);