shell: minor tidy up of `bash_profile`
shell: minor tidy up of `bash_profile`

saclark/dotfiles,seiryu9/dotfiles,seiryu9/dotfiles,pertoyra/dotfiles,marc0uk/dotfiles,lgaechter/dotfiles,codfish/dotfiles,codfish/dotfiles,pmacom/dotfiles,sdillingham/dotfiles,SBoudrias/dotfiles,bronxct1/dotfiles,bronxct1/dotfiles,SiTaggart/dotfiles,necolas/dotfiles,jmyser/dotfiles