FTP: improve character encoding detection in cases where ICU's first guess is wrong.

net/data/ftp/dir-listing-ls-22.expected

Index: net/data/ftp/dir-listing-ls-22.expected
diff --git a/net/data/ftp/dir-listing-ls-22.expected b/net/data/ftp/dir-listing-ls-22.expected
new file mode 100644
index 0000000000000000000000000000000000000000..c5a02b7850f0efcc460e509bdbfd73dec1b45866
--- /dev/null
+++ b/net/data/ftp/dir-listing-ls-22.expected
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