Set staging Koschei load threshold to 100 %

Load is already greatly limited by small value of max number of tasks
(only 4), there is no need to check load.

roles/koschei/backend/templates/config-backend.cfg.j2

@@ -34,11 +34,12 @@ config = {
         {% if env == 'staging' %}
         "max_builds": 4,
         "build_arches": ['i386', 'x86_64', 'armhfp'],
+        "load_threshold": 1,
         {% else %}
         "max_builds": 60,
         "build_arches": ['i386', 'x86_64', 'armhfp', 'aarch64', 'ppc64', 'ppc64le'],
-        {% endif %}
         "load_threshold": 0.65,
+        {% endif %}
         "task_priority": 30,
     },
     "dependency": {