fix(help): correct FTP server default text

Purpose of the change:
- Update the FTP settings help text to describe the current default server state.

Previous behavior:
- The help text said the FTP server is enabled by default.

Why that was a problem:
- The default inetd FTP entry is commented out, so the help text contradicted the default disabled state.

New behavior:
- The FTP help text now says the FTP server is disabled by default.

How it works:
- Changes only the localized English help text for :ftp_server_help:.

Author: elibosley

emhttp/languages/en_US/helptext.txt

@@ -1404,7 +1404,7 @@ stabling is enabled.
 :end
 
 :ftp_server_help:
-Enable or disable the FTP server daemon. By default the FTP server is enabled.
+Enable or disable the FTP server daemon. By default the FTP server is disabled.
 This setting is not saved, i.e. upon system reboot it will revert to its default setting.
 :end