treesitter: propagate on_detach event properly

runtime/lua/vim/treesitter.lua

@@ -44,10 +44,11 @@ function M._create_parser(bufnr, lang, opts)
     self:_on_bytes(...)
   end
 
-  local function detach_cb()
+  local function detach_cb(_, ...)
     if parsers[bufnr] == self then
       parsers[bufnr] = nil
     end
+    self:_on_detach(...)
   end
 
   a.nvim_buf_attach(self:source(), false, {on_bytes=bytes_cb, on_detach=detach_cb, preview=true})