Disable backupninja client log output color by default

Related: PROD-28528
Fixes: PROD-32166

Change-Id: I6cdda7705e9e340f3fe60fafe7c440cf3fba0ffe
diff --git a/backupninja/client/single.yml b/backupninja/client/single.yml
index 0ea839b..7bf8b7b 100644
--- a/backupninja/client/single.yml
+++ b/backupninja/client/single.yml
@@ -6,3 +6,5 @@
       scheduling:
         when:
           - manual
+      log:
+        color: ${_param:backupninja_color_log}