fix: remove bad defaults from selling settings

"All cusotmer groups" and "All territories" are pointless defaults, not
sure why these are made default. They don't help you track anything.
"All" might as well be `Null`.

Even the filters for customer_group suggest it shouldn't be group then
having the root as default makes no sense.
diff --git a/erpnext/selling/doctype/selling_settings/selling_settings.py b/erpnext/selling/doctype/selling_settings/selling_settings.py
index e7c5e76..fb86e61 100644
--- a/erpnext/selling/doctype/selling_settings/selling_settings.py
+++ b/erpnext/selling/doctype/selling_settings/selling_settings.py
@@ -8,7 +8,6 @@
 from frappe.custom.doctype.property_setter.property_setter import make_property_setter
 from frappe.model.document import Document
 from frappe.utils import cint
-from frappe.utils.nestedset import get_root_of
 
 
 class SellingSettings(Document):
@@ -37,9 +36,3 @@
 		editable_bundle_item_rates = cint(self.editable_bundle_item_rates)
 
 		make_property_setter("Packed Item", "rate", "read_only", not(editable_bundle_item_rates), "Check", validate_fields_for_doctype=False)
-
-	def set_default_customer_group_and_territory(self):
-		if not self.customer_group:
-			self.customer_group = get_root_of('Customer Group')
-		if not self.territory:
-			self.territory = get_root_of('Territory')
diff --git a/erpnext/setup/setup_wizard/operations/install_fixtures.py b/erpnext/setup/setup_wizard/operations/install_fixtures.py
index 503aeac..98f9119 100644
--- a/erpnext/setup/setup_wizard/operations/install_fixtures.py
+++ b/erpnext/setup/setup_wizard/operations/install_fixtures.py
@@ -303,7 +303,6 @@
 
 def update_selling_defaults():
 	selling_settings = frappe.get_doc("Selling Settings")
-	selling_settings.set_default_customer_group_and_territory()
 	selling_settings.cust_master_name = "Customer Name"
 	selling_settings.so_required = "No"
 	selling_settings.dn_required = "No"