brscan5: remove deprecated SYSFS udev rule

This patch resolves an issue where systemd-udevd outputs events like:

/nix/store/jm9paymkapbi6pzwbjgmi634vaf2y5va-udev-rules/49-brother-mfp-brscan5-1.0.2-2.rules:17 Invalid key 'SYSFS'.

(cherry picked from commit ff62fe4136)

nixos/tests/brscan5.nix

@@ -48,6 +48,10 @@ import ./make-test-python.nix (
       print(scanimage)
       assert """device `brother5:net1;dev0' is a Brother b ADS-1200""" in scanimage
       assert """device `brother5:net1;dev1' is a Brother a ADS-1200""" in scanimage
+
+      # Confirm systemd-udevd no longer logs errors about SYSFS
+      logs = machine.succeed('journalctl --unit systemd-udevd')
+      assert "Invalid key 'SYSFS'" not in logs
     '';
   }
 )

pkgs/by-name/br/brscan5/package.nix

@@ -79,6 +79,9 @@ stdenv.mkDerivation rec {
       # driver is hardcoded to look in /opt/brother/scanner/brscan5/models for model metadata.
       # patch it to look in /etc/opt/brother/scanner/models instead, so nixos environment.etc can make it available
       printf '/etc/opt/brother/scanner/models\x00' | dd of=opt/brother/scanner/brscan5/libsane-brother5.so.1.0.7 bs=1 seek=${toString patchOffsetBytes} conv=notrunc
+
+      # remove deprecated SYSFS udev rule
+      sed -i -e '/^SYSFS/d' opt/brother/scanner/brscan5/udev-rules/*.rules
     '';
 
   installPhase = ''