[Search directory] Properly show symlink info in file previews (#159)

The files preview code is meant to display info about symlinks when previewing them. However, because test -f and test -d appear before test -L, the symlink message won't show for symlinks to regular files and directories. Fix this by moving the symlink case to the top.

functions/__fzf_preview_file.fish

@@ -4,7 +4,16 @@ function __fzf_preview_file --description "Print a preview for the given file ba
     # as one argument, we collect all the arguments into one single variable and treat that as the path
     set file_path $argv
 
-    if test -f "$file_path" # regular file
+    if test -L "$file_path" # symlink
+        # notify user and recurse on the target of the symlink, which can be any of these file types
+        set -l target_path (realpath $file_path)
+
+        set_color yellow
+        echo "'$file_path' is a symlink to '$target_path'."
+        set_color normal
+
+        __fzf_preview_file "$target_path"
+    else if test -f "$file_path" # regular file
         if set --query fzf_preview_file_cmd
             # need to escape quotes to make sure eval receives file_path as a single arg
             eval $fzf_preview_file_cmd \"$file_path\"
@@ -20,15 +29,6 @@ function __fzf_preview_file --description "Print a preview for the given file ba
             # -F helps classify files by appending symbols after the file name
             command ls -A -F "$file_path"
         end
-    else if test -L "$file_path" # symlink
-        # notify user and recurse on the target of the symlink, which can be any of these file types
-        set -l target_path (realpath $file_path)
-
-        set_color yellow
-        echo "'$file_path' is a symlink to '$target_path'."
-        set_color normal
-
-        __fzf_preview_file "$target_path"
     else if test -c "$file_path"
         __fzf_report_file_type "$file_path" "character device file"
     else if test -b "$file_path"