[libdnf, actions plugin] actions.conf: Set "enabled" to "1"

"Enabled" can now be set for each action separately.
However, to enable actions, the "actions" plugin must be enabled.
If "enabled" for the "actions" plugin is set to `host-only`, the action
will not be performed for the alternate installroot even if it is enabled
for the action.

libdnf5-plugins/actions/actions.conf

@@ -1,3 +1,3 @@
 [main]
 name = actions
-enabled = host-only
+enabled = 1