Fix dispatch_include_wildcard_vars gateway_settings handling

Resolves #1239

Author: myllynen

changelogs/fragments/fix_galaxy_settings_wildcard.yml

@@ -0,0 +1,3 @@
+---
+bugfixes:
+  - Fix wildcard variable handling for gateway_settings

roles/dispatch/tasks/include_wildcard_vars.yml

@@ -11,7 +11,7 @@
 
 - name: include_wildcard_vars | Set fact for gateway_settings
   ansible.builtin.set_fact:
-    gateway_settings: "{{ (gateway_settings | default([])) + lookup('ansible.builtin.vars', item) }}"
+    gateway_settings: "{{ (gateway_settings | default({})) | combine(lookup('ansible.builtin.vars', item), list_merge='append', recursive=true) }}"
   loop: "{{ [] if (lookup('ansible.builtin.varnames', 'gateway_settings.*')) is not string else (lookup('ansible.builtin.varnames', 'gateway_settings.*') | split(',')) }}"
 
 - name: include_wildcard_vars | Set fact for aap_organizations