Incorrect unpacking of image shape in get_newparam_from_current

[cdebonnel]

Description

When creating a new image, the dimensions of the last image are not remembered correctly—the width and height are swapped.

Expected behavior

The dimensions of the last image should be used as default values.

Suggested fix

In the get_newparam_from_current method of ImagePanel, the shape tuple is unpacked as follows:

if curobj is not None: newparam.width, newparam.height = curobj.data.shape

It should be changed to:

if curobj is not None: newparam.height, newparam.width = curobj.data.shape