fix(examples): fix type of tenants variable

Filter returns a generator, so it cannot be indexed on the next line.
With list comprehension the code is also simpler

Author: vlaci

examples/get_tenant_token.py

@@ -17,7 +17,8 @@
 
 if len(sys.argv) > 2:
     # Filter tenants that matches the provided pattern
-    tenants = filter(lambda tenant: sys.argv[2] in tenant.name, tenants)
+    pattern = sys.argv[2]
+    tenants = [t for t in tenants if pattern in t.name]
 
 # Pick the first one
 tenant = tenants[0]