ftp: update encoding in integration tests with ProFtpd, PureFtpd, VsFtpd

PR #5589 established recommended encodings to use with major FTP servers.
This patch updates integration tests correspondingly.

docs/content/ftp.md

@@ -319,3 +319,7 @@ Not all FTP servers can have all characters in file names, for example:
 | --------- |:--------------------:|
 | proftpd   | `*`                  |
 | pureftpd  | `\ [ ]`              |
+
+This backend's interactive configuration wizard provides a selection of
+sensible encoding settings for major FTP servers: ProFTPd, PureFTPd, VsFTPd.
+Just hit a selection number when prompted.

fstest/test_all/config.yaml

@@ -213,18 +213,12 @@ backends:
    fastlist: false
  - backend:  "ftp"
    remote:   "TestFTPProftpd:"
-   ignore:
-     - TestIntegration/FsMkdir/FsEncoding/punctuation
    fastlist: false
- # - backend:  "ftp"
- #   remote:   "TestFTPVsftpd:"
- #   ignore:
- #     - TestIntegration/FsMkdir/FsEncoding/punctuation
- #   fastlist: false
  - backend:  "ftp"
    remote:   "TestFTPPureftpd:"
-   ignore:
-     - TestIntegration/FsMkdir/FsEncoding/punctuation
+   fastlist: false
+ - backend:  "ftp"
+   remote:   "TestFTPVsftpd:"
    fastlist: false
  - backend:  "ftp"
    remote:   "TestFTPRclone:"