ext.PageTriage.enqueue - don't specify empty styles array
ext.PageTriage.enqueue - don't specify empty styles array

No need for `"styles": [],` - if no styles are given, none are assumed

Added in 7e26fc595ecc90ff11dafbe00384f14d33398719 without a reason
why it might be needed

Change-Id: I419efabd1f687e3e0d373a0790a62fe3bfb890a9

wikimedia/mediawiki-extensions-PageTriage,wikimedia/mediawiki-extensions-PageTriage,wikimedia/mediawiki-extensions-PageTriage