test.aria.widgets.icon.IconTest failing on IE10

This pull request fixes ``test.aria.widgets.icon.IconTest`` which started failing in d483056c6edf8064781d069101fdca40b874ac15 because the type of ``absolutePosition.top`` in the popup configuration changed from ``json:Float`` to ``json:Integer`` (when the config bean was moved from ``aria.utils.DomBeans`` to ``aria.popups.Beans``).
This PR restores ``json:Float`` in ``aria.popups.Beans.AbsolutePositionConfig``.