Pass in type explicitly for initial-default (#2296)

# Rationale for this change

I noticed we just passed in the value, without setting the type
explicitly. By default, PyArrow will for example upscale 1 to an int64
field, while the column is of type int32 in the table.

# Are these changes tested?

# Are there any user-facing changes?

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Author: Fokko

pyiceberg/io/pyarrow.py

@@ -1805,7 +1805,7 @@ def struct(
                 elif field.initial_default is None:
                     field_arrays.append(pa.nulls(len(struct_array), type=arrow_type))
                 else:
-                    field_arrays.append(pa.repeat(field.initial_default, len(struct_array)))
+                    field_arrays.append(pa.repeat(pa.scalar(field.initial_default, type=arrow_type), len(struct_array)))
                 fields.append(self._construct_field(field, arrow_type))
             else:
                 raise ResolveError(f"Field is required, and could not be found in the file: {field}")