WIP Use clientX/Y verification only for IE

clientX/Y properties  doesn't exist on new browser.

Fix a bug mentioned by @loicgasser: when we quickly drag the map the tooltip was requested.


[Test](http://mf-geoadmin3.dev.bgdi.ch/teo_tooltip_mobile/mobile.html?X=190000.00&Y=660000.00&zoom=1&lang=fr&topic=ech&bgLayer=ch.swisstopo.pixelkarte-farbe&mobile=true&layers=ch.bafu.biogeographische_regionen&layers_opacity=0.75)