Replace hardcoded component in test with argument

The `inertia_page` method currently doesn't use the component that's
given as an argument. This commit fixes that.

Author: nootr

inertia/test.py

@@ -55,12 +55,12 @@ def assertComponentUsed(self, component_name):
 
 def inertia_page(url, component='TestComponent', props={}, template_data={}):
   return {
-    'component': 'TestComponent',
+    'component': component,
     'props': props,
     'url': f'http://testserver/{url}/',
     'version': settings.INERTIA_VERSION,
   }
 
 def inertia_div(*args, **kwargs):
   page = inertia_page(*args, **kwargs)
-  return f'<div id="app" data-page="{escape(dumps(page))}"></div>'
+  return f'<div id="app" data-page="{escape(dumps(page))}"></div>'