update cc-crop-area from control center

The two CcCropArea shared the exact same source code at 0733806c and gnome-control-center@7f8e90a9.

Since then, Settings received the following changes:

• gnome-control-center!1686 (merged):

  Fixing gnome-control-center#2359 (closed), also applying to Contacts, where the cursor indicating dragging is seen outside the crop area.

• gnome-control-center!1807 (merged):

  A clean-up with connecting signal handlers in swapped form.

• gnome-control-center!1825 (merged):

  Amongst other, the behaviour before this was that only the x-axis mattered for resizing, while now the cursor will sit on the boundary of the area regardless of its direction for resizing.

• gnome-control-center!1824 (merged):

  This eliminates the preview area jittering and the corner indicators being partially outside the image.