Remove unused n_dims parameter from Fourier.inv_shift_fourier (#8766)

As discussed here: #8762

---------

Signed-off-by: Soumya Snigdha Kundu <soumya_snigdha.kundu@kcl.ac.uk>
Co-authored-by: Eric Kerfoot <17726042+ericspod@users.noreply.github.com>

Author: aymuos15

monai/transforms/utils.py

@@ -1884,9 +1884,7 @@ def shift_fourier(x: NdarrayOrTensor, spatial_dims: int, as_contiguous: bool = F
         return ascontiguousarray(k) if as_contiguous else k
 
     @staticmethod
-    def inv_shift_fourier(
-        k: NdarrayOrTensor, spatial_dims: int, n_dims: int | None = None, as_contiguous: bool = False
-    ) -> NdarrayOrTensor:
+    def inv_shift_fourier(k: NdarrayOrTensor, spatial_dims: int, as_contiguous: bool = False) -> NdarrayOrTensor:
         """
         Applies inverse shift and fourier transform. Only the spatial
         dimensions are transformed.