feat: remove Dunning dashboard as there are no incoming links

erpnext/accounts/doctype/dunning/dunning_dashboard.py

@@ -1,19 +0,0 @@
-from __future__ import unicode_literals
-
-from frappe import _
-
-
-def get_data():
-	return {
-		'fieldname': 'dunning',
-		'non_standard_fieldnames': {
-			'Journal Entry': 'reference_name',
-			'Payment Entry': 'reference_name'
-		},
-		'transactions': [
-			{
-				'label': _('Payment'),
-				'items': ['Payment Entry', 'Journal Entry']
-			}
-		]
-	}