chore: Remove unused code

- and simplify get_call_log

erpnext/telephony/doctype/call_log/call_log.py

@@ -95,14 +95,6 @@ class CallLog(Document):
 				frappe.publish_realtime("show_call_popup", self, user=email)
 
 
-def get_employee_name(emp):
-	employee_name = ""
-	for name in ["first_name", "middle_name", "last_name"]:
-		if emp.get(name):
-			employee_name += (" " if employee_name else "") + emp.get(name)
-	return employee_name
-
-
 @frappe.whitelist()
 def add_call_summary_and_call_type(call_log, summary, call_type):
 	doc = frappe.get_doc("Call Log", call_log)