Update acceptance test expected output for auto-default on first login

The auth login acceptance tests now expect the [__databricks-settings__]
section in out.databrickscfg and (Default) marker in auth profiles output,
since first-profile login auto-sets the default.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: simonfaltum

acceptance/cmd/auth/login/nominal/out.databrickscfg

@@ -4,3 +4,6 @@
 [test]
 host      = [DATABRICKS_URL]
 auth_type = databricks-cli
+
+[__databricks-settings__]
+default_profile = test

acceptance/cmd/auth/login/nominal/output.txt

@@ -3,5 +3,5 @@
 Profile test was successfully saved
 
 >>> [CLI] auth profiles
-Name  Host                    Valid
-test  [DATABRICKS_URL]  YES
+Name            Host                    Valid
+test (Default)  [DATABRICKS_URL]  YES

acceptance/cmd/auth/login/with-scopes/out.databrickscfg

@@ -5,3 +5,6 @@
 host      = [DATABRICKS_URL]
 scopes    = jobs,pipelines,clusters
 auth_type = databricks-cli
+
+[__databricks-settings__]
+default_profile = scoped-test