Fix double use of mail directory in parsemail-batch.sh

2d142b2 ("bin: Run scripts through shellcheck") changes an
ls to a find. find output includes the directory name, unlike ls.
This breaks the script, because it prepends the mail directory
later on.

Remove the prepending in the script - leave it exclusively to find.

Signed-off-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: stephen@that.guru
Fixes: 2d142b2 ("bin: Run scripts through shellcheck")

patchwork/bin/parsemail-batch.sh

@@ -40,5 +40,5 @@ shift
 find "$mail_dir" -maxdepth 1 |
 while read -r line; do
     echo "$line"
-    "$BIN_DIR/parsemail.sh" "$@" < "$mail_dir/$line"
+    "$BIN_DIR/parsemail.sh" "$@" < "$line"
 done