nvim: autocmd: On exit set cursor shape to horizontal & not vertical

We specify an underline cursor shape in terminal settings. This actually
fixes 5c6eebf where we just copied the settings from the referenced
issue but did not actually fix it.

nvim/.config/nvim/lua/autocmd.lua

@@ -40,7 +40,7 @@ local aucmd_dict = {
     {
       group   = "custom_group",
       pattern = "*",
-      command = "set guicursor=a:ver1-blinkon0"
+      command = "set guicursor=a:hor1-blinkon0"
     }
   }
 }