Remove default file encoding from python3 shebangs
Remove default file encoding from python3 shebangs

Python3 uses UTF-8 by default. We don't have to add it explicitly.
See `python3 -c 'import sys; print(sys.getdefaultencoding())'`.

tinyheero/vim-snippets,fran-penedo/vim-snippets,adam-e-trepanier/vim-snippets,honza/vim-snippets,honza/vim-snippets,mjnicky/vim-snippets,tinyheero/vim-snippets,phatograph/vim-snippets,needle-wang/vim-snippets,LogicalBricks/vim-snippets,sjewo/vim-snippets,kevinkirkup/vim-snippets,craigp/vim-snippets,phatograph/vim-snippets,craigp/vim-snippets,kevinkirkup/vim-snippets,LogicalBricks/vim-snippets,mjnicky/vim-snippets,fran-penedo/vim-snippets,rtorralba/vim-snippets,rtorralba/vim-snippets,adam-e-trepanier/vim-snippets,sjewo/vim-snippets,vito-c/vim-snippets,vito-c/vim-snippets,needle-wang/vim-snippets