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

net/data/ftp/dir-listing-ls-20.expected

Index: net/data/ftp/dir-listing-ls-20.expected
diff --git a/net/data/ftp/dir-listing-ls-20.expected b/net/data/ftp/dir-listing-ls-20.expected
new file mode 100644
index 0000000000000000000000000000000000000000..9c636b9307d3aa7c61f6782456a878c1af08a415
--- /dev/null
+++ b/net/data/ftp/dir-listing-ls-20.expected
@@ -0,0 +1,161 @@
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