Fix mis-scaled signals for subject 031: divide by 1e6 (part 26/33 of full fix for subjects 004,005,008-035,058-060).

sourcedata/braindecode/dataset.zarr/recording_31/data/c/0/0/0

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:a170e63df8b45cf01fcca762a4aaa88c66e19dba9b6c237d91542c1717ef47a0
-size 18496174
+oid sha256:b14a2e1ef9b4db377b8a2ba70c30e738c3d03bb61b3afc9b78311f42ead48dc3
+size 18493793

sourcedata/braindecode/dataset.zarr/recording_31/data/c/1/0/0

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:330be4882f27e0f1830e4e42337dbc96559059c1f4e4f56d19322570d5f6c847
-size 11554042
+oid sha256:04e966314e49f878e5901c8de18b9032a52183a121294bb231555ed34baf8668
+size 11552576