Fix Fish autocomplete suggestions for sessions

misc/auto-completion/fish/nnn.fish

@@ -15,7 +15,7 @@ complete -c nnn -s a    -d 'use access time'
 complete -c nnn -s b -r -d 'bookmark key to open' -x -a '(echo $NNN_BMS | awk -F: -v RS=\; \'{print $1"\t"$2}\')'
 complete -c nnn -s c    -d 'cli-only opener'
 complete -c nnn -s d    -d 'start in detail mode'
-complete -c nnn -s e -r -d 'load session by name' -x -a '@\t"last session" (ls $nnn_config)'
+complete -c nnn -s e -r -d 'load session by name' -x -a '@\t"last session" (ls $sessions_dir)'
 complete -c nnn -s f    -d 'run filter as cmd on prompt key'
 complete -c nnn -s H    -d 'show hidden files'
 complete -c nnn -s i    -d 'start in navigate-as-you-type mode'