Increase chunk-artifacts amount

  * One test currently spawn 24 chunks.

Change-Id: I9f541574cad74262a22d064fc20ed4d5462e2981
diff --git a/jenkins/client/job/salt-models/tests.yml b/jenkins/client/job/salt-models/tests.yml
index ee4d107..145cfa9 100644
--- a/jenkins/client/job/salt-models/tests.yml
+++ b/jenkins/client/job/salt-models/tests.yml
@@ -387,7 +387,7 @@
             build:
               keep_num: 300
             artifact:
-              keep_num: 30
+              keep_num: 300
           type: workflow-scm
           concurrent: true
           plugin_properties: