__fish_cached: tolerate trailing newline

In POSIX sh, ";" is not a valid statement, leading to errors when the
__fish_cached callback argument has a trailing newline (5c2073135e
(Fix syntax error in __fish_print_port_packages.fish, 2025-11-14)).

Use a newline instead of ";", to avoid this error.

While at it, replace rogue tab characters.

share/functions/__fish_cached.fish

@@ -23,9 +23,15 @@ function __fish_cached --description "Cache the command output for a given amoun
     set -l cache_file (path normalize $cache_dir/$cache_key)
     set -l cache_age (path mtime --relative $cache_file)
 
+    set -l populate_cache sh -c "
+        {
+            $argv
+        } >$cache_file || rm $cache_file 2>/dev/null
+    "
+
     if not test -f $cache_file
         __fish_cache_put $cache_file
-        sh -c "{ $argv; } >$cache_file || rm $cache_file 2>/dev/null" &
+        $populate_cache &
 
         if test -n "$last_pid"
             # wait for at most 1 second if supported
@@ -39,7 +45,7 @@ function __fish_cached --description "Cache the command output for a given amoun
 
         if test $cache_age -gt $max_age
             __fish_cache_put $cache_file
-            sh -c "{ $argv; } >$cache_file || rm $cache_file 2>/dev/null" &
+            $populate_cache &
         end
     end
 end

share/functions/__fish_print_port_packages.fish

@@ -3,7 +3,8 @@ function __fish_print_port_packages
     type -q -f port || return 1
 
     __fish_cached -t 250 -k port '
-    	printf "all\ncurrent\nactive\ninactive\ninstalled\nuninstalled\noutdated\n"
-    	port echo all | awk \'{$1=$1};1\''
+        printf "all\ncurrent\nactive\ninactive\ninstalled\nuninstalled\noutdated\n"
+        port echo all | awk \'{$1=$1};1\'
+    '
     return 0
 end