[minor][fix] call update_percent_complete via validate (#15235)

diff --git a/erpnext/projects/doctype/project/project.py b/erpnext/projects/doctype/project/project.py
index 4ee447d..75582cd 100644
--- a/erpnext/projects/doctype/project/project.py
+++ b/erpnext/projects/doctype/project/project.py
@@ -69,6 +69,7 @@
 		self.tasks = []
 		self.load_tasks()
 		self.send_welcome_email()
+		self.update_percent_complete()
 
 	def validate_project_name(self):
 		if self.get("__islocal") and frappe.db.exists("Project", self.project_name):