Fix mixed indentation

roles/matrix-base/templates/static-files/well-known/matrix-support.j2

@@ -1,7 +1,7 @@
 #jinja2: lstrip_blocks: "True"
 {
     "admins": {{ matrix_homeserver_admin_contacts|to_json }}
-	{% if matrix_homeserver_support_url %},
-    "support_page": "{{ matrix_homeserver_support_url|to_json }}"
-	{% endif %}
+    {% if matrix_homeserver_support_url %},
+        "support_page": "{{ matrix_homeserver_support_url|to_json }}"
+    {% endif %}
 }