odoo saves the content of your xml file in his database. As long as the file isn't written to the database odoo takes the view from the database and NOT from your upgraded xml file.
You can force odoo to write the file to the database by upgrading your module. Make sure that the xml file is listed in the manifest and the xml file doesn't have a noupdate=True tag.
Another way is to start your odoo server with the --dev=all option. With this option odoo does take its qweb information directly from the xml files.
You can also start the server with -u <name of the module the xml is part of / the xml is listed in the manifest>. -u stands for upgrade and upgrades the module you name afterwards after the start of the server.