Incorrect hint characters with non-ascii motion keys and easymotion-overwin-f

[maxigaz]

It looks like #16 may have addressed this in general, but not for easymotion-overwin-f.

To reproduce:

1. Add the following to your vimrc/init.vim:

   nmap <F2> <Plug>(easymotion-overwin-f)
   let g:EasyMotion_keys = 'asdfhjkqweruiopyxcvbnmlé'
   

2. Create a new file

3. Copy and paste the following Lorem ipsum several times:

   Lorem ipsum dolor sit amet, consectetur adipisicing elit

4. Invoke easymotion-overwin-f and search for t.

Here's a screenshot of the results (notice especially the hint characters Ã and © in the last few lines):

Here's how it should look like. (This is the same text, but this time easymotion-s is invoked.)

Tested with Neovim v0.4.4 and EasyMotion installed through Plug 'easymotion/vim-easymotion'.