sane vim indentation defaults for new files

Currently vim puts a modeline to new scala files and sets `ts=4 sw=4` which conflicts with the standard 2 space indentation as also discussed in #5 and #6. This is probably just forgotton like this. I also commented this out since vim already sets these values in the indent file and modeline templates can (and imo should) always go to personal vimrc files instead.