update which-key conf

lua/config/which-key.lua

@@ -3,6 +3,6 @@ require("which-key").setup{
     -- list of mode / prefixes that should never be hooked by WhichKey
     -- this is mostly relevant for key maps that start with a native binding
     -- most people should not need to change this
-    n = { "o", },
+    n = { "o", "O" },
   },
 }