brscan5: fix hardware.sane.brscan5 config

nixos/modules/services/hardware/sane_extra_backends/brscan5_etc_files.nix

@@ -58,17 +58,17 @@ stdenv.mkDerivation {
   dontConfigure = true;
 
   buildPhase = ''
-    TARGET_DIR="$out/etc/opt/brother/scanner/brscan5"
+    TARGET_DIR="$out/tmp"
     mkdir -p "$TARGET_DIR"
     cp -rp "./models" "$TARGET_DIR"
     cp -rp "./brscan5.ini" "$TARGET_DIR"
     cp -rp "./brsanenetdevice.cfg" "$TARGET_DIR"
-
     export NIX_REDIRECTS="/etc/opt/brother/scanner/brscan5/=$TARGET_DIR/"
-
     printf '${addAllNetDev netDevices}\n'
-
     ${addAllNetDev netDevices}
+
+    mkdir -p "$out/etc/opt/brother/scanner/brscan5"
+    mv -T "$TARGET_DIR" "$out/etc/opt/brother/scanner/brscan5"
   '';
 
   dontInstall = true;