Remove size specialization of StringTensor which should have been nbytes

Signed-off-by: Christoph Berganski <[email protected]>

Author: iksnagreb

src/onnx_ir/_core.py

@@ -836,15 +836,10 @@ def shape(self) -> Shape:
         """The shape of the tensor. Immutable."""
         return self._shape
 
-    @property
-    def size(self) -> int:
-        """The number of elements in the tensor."""
-        return sum(len(string) for string in self.string_data())
-
     @property
     def nbytes(self) -> int:
         """The number of bytes in the tensor."""
-        return self.size
+        return sum(len(string) for string in self.string_data())
 
     @property
     def raw(self) -> Sequence[bytes] | npt.NDArray[np.bytes_]: