chore: Remove unused code

- and simplify get_call_log
diff --git a/erpnext/erpnext_integrations/exotel_integration.py b/erpnext/erpnext_integrations/exotel_integration.py
index 82bcb8d..522de9e 100644
--- a/erpnext/erpnext_integrations/exotel_integration.py
+++ b/erpnext/erpnext_integrations/exotel_integration.py
@@ -68,16 +68,9 @@
 
 
 def get_call_log(call_payload):
-	call_log = frappe.get_all(
-		"Call Log",
-		{
-			"id": call_payload.get("CallSid"),
-		},
-		limit=1,
-	)
-
-	if call_log:
-		return frappe.get_doc("Call Log", call_log[0].name)
+	call_log_id = call_payload.get("CallSid")
+	if frappe.db.exists("Call Log", call_log_id):
+		return frappe.get_doc("Call Log", call_log_id)
 
 
 def create_call_log(call_payload):
diff --git a/erpnext/telephony/doctype/call_log/call_log.py b/erpnext/telephony/doctype/call_log/call_log.py
index 7ef16d7..e7fe7ab 100644
--- a/erpnext/telephony/doctype/call_log/call_log.py
+++ b/erpnext/telephony/doctype/call_log/call_log.py
@@ -95,14 +95,6 @@
 				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)