Fix for failing Dask-test: Use second dimension of 2d-regrid array fo…

…r defining blocks of extra dimension(s), use .shape for the topology dimension.

xugrid/regrid/regridder.py

@@ -154,7 +154,7 @@ def _regrid_array(self, source):
             # in a single contiguous chunk.
             contiguous_chunks = (source.chunks[0], (source.shape[-1],))
             source = source.rechunk(contiguous_chunks)
-            chunks = source.chunks[: -source_grid.ndim] + (self._target.shape)
+            chunks = source.chunks[:-1] + (self._target.size,)
             out = dask.array.map_blocks(
                 self._regrid,  # func
                 source,  # *args