Fix mis-scaled signals for subject 020: divide by 1e6 (part 15/33 of full fix for subjects 004,005,008-035,058-060).

sourcedata/braindecode/dataset.zarr/recording_20/data/c/0/0/0

@@ -1,3 +1,3 @@
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-oid sha256:56b307aea726e5014cce5dccf90528b5fd197c26246d14b5cfb268b99e4e8fe3
-size 18445051
+oid sha256:960e14c2ceb8bfd138cf23c380831b6c1b987023c73431c927457afecd4a466f
+size 18440085

sourcedata/braindecode/dataset.zarr/recording_20/data/c/1/0/0

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:3d63a8257f497e181a694765bb7685b36ea631519a4cd345cb7404ec4924fc2e
-size 11526018
+oid sha256:1b21f5bafe3c9a26cc8f815b60baa4c20f7794f2e8ebf295c14052fbbd2ea5ad
+size 11522555