fix!: Correct resolution order for template page (#20927)

Current resolution is confusing mess:

1. Evaluation is done in order of installed app, first install wins
2. Except frappe, frappe is treated as lowest priority.

Following same principle of "last write wins" everywhere similar to
previous PRs:

- https://github.com/frappe/frappe/pull/17869
- https://github.com/frappe/frappe/pull/20648
- https://github.com/frappe/frappe/pull/19653

Closes https://github.com/frappe/frappe/issues/20377

frappe/website/page_renderers/template_page.py

@@ -50,7 +50,7 @@ class TemplatePage(BaseTemplatePage):
 		and /templates/pages folders and sets path if match is found
 		"""
 		folders = get_start_folders()
-		for app in frappe.get_installed_apps(frappe_last=True):
+		for app in reversed(frappe.get_installed_apps()):
 			app_path = frappe.get_app_path(app)
 
 			for dirname in folders: