[BUG] Component style is not updated after the drag event in Dragmode('absolute')

In the new dragmode the component's style is not updated after dragging the component.

Expected behaviour:

1. Drag element by clicking on the component(or the toolbar icon)
2. After the components is 'dropped' the style should be updated with the new position

Current behaviour:

1. You drag the component somewhere else
2. The x and y position (top,left) are the same as before the dragging

There is an exception: if the stylemanager panel is not open yet and then you drag the component then it will be updated correctly(only for the first time since then the panel is open)

The issue is reproducable in the demo as well. https://jsfiddle.net/yt0wz29p/

Steps to reproduce:

1. Open the demo with dragmode
2. Have a set x and y values(for example 0px and 0px)
3. Drag the component and check the new x and y values

GrapesJS Version:0.15.8