Fix mis-scaled signals for subject 028: divide by 1e6 (part 23/33 of full fix for subjects 004,005,008-035,058-060).

sourcedata/braindecode/dataset.zarr/recording_28/data/c/0/0/0

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:e24f357a525ceb0088ad211823246796f798949935db36808b60470e2e755c76
-size 18551488
+oid sha256:4ab9941e90fa237ea051c2958298f3eccfbcaee010b0c350046d910c4dc66cf1
+size 18547222

sourcedata/braindecode/dataset.zarr/recording_28/data/c/1/0/0

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:6c266317c9993e006f69a51ad59dbb91e36f8d83fff08dfe10eb8ed8173c1c08
-size 11792267
+oid sha256:84436002ecdd90a0fbdd33f339c911058be1483b56efaa4fe22dadbd2589e59d
+size 11789073