Bug fix for activateLayerTool

A recent change of moving activateLayerTool from GeoMOOSE/UI/Toolbar.js into geomoose.js has caused the sketch tools to not deactivate properly.  The scope of "this" is not the same.

To replicate the bug open the demo and draw a polygon.  Then switch to a point or line and both tools will still be active.

A change might also be needed for Popups.js.