BUG: SF2D fft mode doesn't work for non square boxes.

[kai-luca]

Description:

The problem is that the qx, qy arrays are transposed.
For a square box this doesn't matter. Other modes work fine as well.

Code for reproduction:

sf_xy, qx, qy = sf2d(frame.coords(), frame.box, mode="fft")
sf_xy[abs(qx)<20]

Error message:

IndexError: boolean index did not match indexed array along axis 0; size of axis is 7449 but size of corre

Python and AMEP versions:

Python 3.13.2
amep 1.1.1

Additional information:

No response

How did you install AMEP?

from source