docs: fix linemode example

docs/configuration/yazi.md

@@ -82,17 +82,17 @@ linemode = "size_and_mtime"
 ```lua
 -- ~/.config/yazi/init.lua
 function Linemode:size_and_mtime()
-	local year = os.date("%Y")
 	local time = math.floor(self._file.cha.modified or 0)
-
-	if time > 0 and os.date("%Y", time) == year then
+	if time == 0 then
+		time = ""
+	elseif os.date("%Y", time) == os.date("%Y") then
 		time = os.date("%b %d %H:%M", time)
 	else
-		time = time and os.date("%b %d  %Y", time) or ""
+		time = os.date("%b %d  %Y", time)
 	end
 
 	local size = self._file:size()
-	return ui.Line(string.format(" %s %s ", size and ya.readable_size(size) or "-", time))
+	return ui.Line(string.format("%s %s", size and ya.readable_size(size) or "-", time))
 end
 ```