Fix prediction with blocking

There was an issue during the merging process of the blocks. The `local_slice` needs the halo information and not the padding. Since padding can be applied only if the expansion doesn't include the actual image pixels.

Author: Theodoros Katzalis

bioimageio/core/block_meta.py

@@ -161,8 +161,8 @@ def local_slice(self) -> PerAxis[SliceInfo]:
         return Frozen(
             {
                 a: SliceInfo(
-                    self.padding[a].left,
-                    self.padding[a].left + self.inner_shape[a],
+                    self.halo[a].left,
+                    self.halo[a].left + self.inner_shape[a],
                 )
                 for a in self.inner_slice
             }