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

net/data/ftp/dir-listing-ls-21.expected

Index: net/data/ftp/dir-listing-ls-21.expected
diff --git a/net/data/ftp/dir-listing-ls-21.expected b/net/data/ftp/dir-listing-ls-21.expected
new file mode 100644
index 0000000000000000000000000000000000000000..0111be16235c0b156776aa48bfb8a786a2b1a3ff
--- /dev/null
+++ b/net/data/ftp/dir-listing-ls-21.expected
@@ -0,0 +1,242 @@
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