fix: schedule setting buffer modifiable

fixes #17

Author: b0o

lua/nui-components/component/init.lua

@@ -395,8 +395,8 @@ function Component:initial_value()
 end
 
 function Component:modify_buffer_content(modify_fn)
-  self:set_buffer_option("modifiable", true)
   vim.schedule(function()
+    self:set_buffer_option("modifiable", true)
     modify_fn()
     vim.schedule(function()
       self:set_buffer_option("modifiable", false)