fix: re-execute add_standard_navbar_items patch

- check that same items aren't appended again
diff --git a/erpnext/patches.txt b/erpnext/patches.txt
index c686635..ff9433a 100644
--- a/erpnext/patches.txt
+++ b/erpnext/patches.txt
@@ -720,7 +720,7 @@
 erpnext.patches.v12_0.update_item_tax_template_company
 erpnext.patches.v13_0.move_branch_code_to_bank_account
 erpnext.patches.v13_0.healthcare_lab_module_rename_doctypes
-erpnext.patches.v13_0.add_standard_navbar_items #4
+erpnext.patches.v13_0.add_standard_navbar_items #2021-03-24
 erpnext.patches.v13_0.stock_entry_enhancements
 erpnext.patches.v12_0.update_state_code_for_daman_and_diu
 erpnext.patches.v12_0.rename_lost_reason_detail
diff --git a/erpnext/setup/install.py b/erpnext/setup/install.py
index 0bb480b..29fd0e6 100644
--- a/erpnext/setup/install.py
+++ b/erpnext/setup/install.py
@@ -142,13 +142,15 @@
 		}
 	]
 
-	current_nabvar_items = navbar_settings.help_dropdown
+	current_navbar_items = navbar_settings.help_dropdown
 	navbar_settings.set('help_dropdown', [])
 
 	for item in erpnext_navbar_items:
-		navbar_settings.append('help_dropdown', item)
+		current_labels = [item.get('item_label') for item in current_navbar_items]
+		if not item.get('item_label') in current_labels:
+			navbar_settings.append('help_dropdown', item)
 
-	for item in current_nabvar_items:
+	for item in current_navbar_items:
 		navbar_settings.append('help_dropdown', {
 			'item_label': item.item_label,
 			'item_type': item.item_type,