Remove obsolete -f flag for neovim

Author: vimpostor

tests/Makefile

@@ -3,4 +3,4 @@ tests: tests_vim tests_neovim
 tests_vim:
 	touch /tmp/.vim-tpipeline.test && TMUX='' tmux -L vim-tpipeline -f tmux.conf new-session 'vim -f --not-a-term -u vimrc -S run_test.vim test_general.vim || rm /tmp/.vim-tpipeline.test' && rm /tmp/.vim-tpipeline.test &>/dev/null || ( cat *.failed.log && false )
 tests_neovim:
-	touch /tmp/.vim-tpipeline.test && TMUX='' tmux -L vim-tpipeline -f tmux.conf new-session 'nvim -f -u vimrc -S run_test.vim test_general.vim || rm /tmp/.vim-tpipeline.test' && rm /tmp/.vim-tpipeline.test &>/dev/null || ( cat *.failed.log && false )
+	touch /tmp/.vim-tpipeline.test && TMUX='' tmux -L vim-tpipeline -f tmux.conf new-session 'nvim -u vimrc -S run_test.vim test_general.vim || rm /tmp/.vim-tpipeline.test' && rm /tmp/.vim-tpipeline.test &>/dev/null || ( cat *.failed.log && false )