fix: Get user_id of employee instead of name

- Remove caching from lead
diff --git a/erpnext/communication/doctype/call_log/call_log.py b/erpnext/communication/doctype/call_log/call_log.py
index 8d9e39b..fae649c 100644
--- a/erpnext/communication/doctype/call_log/call_log.py
+++ b/erpnext/communication/doctype/call_log/call_log.py
@@ -46,9 +46,10 @@
 
 	employees = frappe.get_all('Employee', or_filters={
 		'phone': ['like', '%{}'.format(number)],
-	}, limit=1)
+		'user_id': ['!=', '']
+	}, fields=['user_id'], limit=1)
 
-	employee = employees[0].name if employees else None
+	employee = employees[0].user_id if employees else None
 	frappe.cache().hset('employee_with_number', number, employee)
 
 	return employee
\ No newline at end of file
diff --git a/erpnext/crm/doctype/lead/lead.py b/erpnext/crm/doctype/lead/lead.py
index 15174ef..3ee6844 100644
--- a/erpnext/crm/doctype/lead/lead.py
+++ b/erpnext/crm/doctype/lead/lead.py
@@ -23,13 +23,6 @@
 		self.get("__onload").is_customer = customer
 		load_address_and_contact(self)
 
-	def on_update(self):
-		doc = self.get_doc_before_save()
-		for field in ['mobile_no', 'phone']:
-			old_number = doc.get(field)
-			if old_number and old_number != self.get(field):
-				frappe.cache().hdel('lead_with_number', old_number)
-
 	def validate(self):
 		self.set_lead_name()
 		self._prev = frappe._dict({
@@ -241,15 +234,11 @@
 def get_lead_with_phone_number(number):
 	if not number: return
 
-	lead = frappe.cache().hget('lead_with_number', number)
-	if lead: return lead
-
 	leads = frappe.get_all('Lead', or_filters={
 		'phone': ['like', '%{}'.format(number)],
 		'mobile_no': ['like', '%{}'.format(number)]
 	}, limit=1)
 
 	lead = leads[0].name if leads else None
-	frappe.cache().hset('lead_with_number', number, lead)
 
 	return lead
\ No newline at end of file