label.showOnMouseOver doesn't always obey its value

[liamlaverty]

This happens in the Markers Label Example (http://tombatossals.github.io/angular-openlayers-directive/examples/063-markers-properties-example.html) - and any application I've been building. See screenshot (in the screenshot I'm hovering over the Santiago marker, and both "show" attributes are set to false.

You can reproduce the error by unticking both of the the "label show" and "label show on marker mouseover", then ticking "Label show on marker", then hover over the marker once. Then enable "Label Show", then disable both. For some reason after the settings have been updated a couple of times it just always acts as if it's set to "showOnMouseOver":true, even when the property is set to false