refactor: set filetype after other options

This allows filetype plugins, such as `mysql.vim`, to override any of
the special query buffer settings if needed.

A similar pattern of setting `filetype` before other settings is present
for the DBUI drawer. I assume this is more deliberate, and is out of
scope for kristijanhusak#267, so I haven't changed this
part.

This change was not signed off, so might be reverted.

BREAKING-CHANGE: Options set in filetype plugins are now preferred for
		 query buffers.
Link: https://github.com/kristijanhusak/vim-dadbod-ui/blob/0f51d8de368c8c6220973e8acd156d17da746f4c/autoload/db_ui/drawer.vim?plain=1#L38

autoload/db_ui/query.vim

@@ -167,7 +167,7 @@ function! s:query.setup_buffer(db, opts, buffer_name, was_single_win) abort
   endif
 
   if &filetype !=? a:db.filetype || !is_existing_buffer
-    silent! exe 'setlocal filetype='.a:db.filetype.' noswapfile nowrap nospell modifiable'
+    silent! exe 'setlocal noswapfile nowrap nospell modifiable filetype='.a:db.filetype
   endif
   let is_sql = &filetype ==? a:db.filetype
   nnoremap <silent><buffer><Plug>(DBUI_EditBindParameters) :call <sid>method('edit_bind_parameters')<CR>