Enable unequal width and height of the input

[plibera]

This PR aims to fix an error encountered when unequal input width and height are specified (e.g. 320x224). The goal is to use the full field of view of the camera instead of the square center crop.

With the original version, simply changing the input dimensions in the parameters leads to errors with tensors dimensions, e.g. RuntimeError: shape '[224, 320, -1]' is invalid for input of size 4566016.

This PR fixes the error and enables using unequal dimensions of the input (the dimensions still need to be divisible by the patch size).

Tested on the robot and with the Jackal simulation demo.