fix: 修复file_preview 未带如$1 的错误

README.md

@@ -26,7 +26,7 @@ fork自 oh my zsh，更纯净 更快速
 - fzf
 - fd
 - bat (可选 更好的文本预览效果)
-- exa (可选 更好的ls预览效果)
+- exa (可选 更好的目录预览效果)
 
 ```plaintext
   请自行安装fd

lib/file_preview.sh

@@ -2,7 +2,7 @@
 mime=$(file -bL --mime-type "$1")
 category=${mime%%/*}
 if [ -d "$1" ]; then
-    exa -l --no-user --no-time --icons 2>/dev/null || ls --color=tty "$1" || ls -G "$1"
+    exa -l --no-user --no-time --icons "$1" 2>/dev/null || ls --color=tty "$1" || ls -G "$1"
 elif [ "$category" = text ]; then
     (bat -p --color=always "$1" || cat "$1") 2>/dev/null | head -100
 elif [ "$category" = image ]; then