Is your feature request related to a problem? Please describe.
In the current LocalNet implementation, the extract_levels arguments are not directly passed to its parent class RegUNet. Instead, the deepest level max(extract_levels) is passed as the depth argument. Consequentially, the output_block only takes decoded features at the deepest extract level as input.

Describe the solution you'd like
Amend the code to pass the extract_levels arguments to its parent class RegUNet.

Describe alternatives you've considered
N/A

Additional context
N/A