OSCDDataModule initialises with batch_size 1, ignoring the configured batch_size

[robmarkcole]

Description

In the init of OSCD:

super().__init__(OSCD, 1, num_workers, **kwargs)

However other datamodules pass along the batchsize: e.g.

super().__init__(UCMerced, batch_size, num_workers, **kwargs)

This also affects:

• https://github.com/microsoft/torchgeo/blob/main/torchgeo/datamodules/levircd.py

Steps to reproduce

Use the datamodule

Version

dev