~/.vimrc: Fix automatic project loading.

Only load a `.project.vim` when no other file is to be loaded.

.vimrc

@@ -201,6 +201,6 @@ if getcwd() != $HOME && filereadable('.vimrc')
	source .vimrc
endif
if filereadable('.project.vim') && expand("%p") != ".git/COMMIT_EDITMSG"
if filereadable('.project.vim') && expand("%") == ""
	silent source .project.vim
endif