Ignore Vim untitled and unsaved buffer swapfiles

Vim creates buffer swapfiles starting at .swp for buffers that are
active but untitled and unsaved.

Global/vim.gitignore

@@ -1,4 +1,4 @@
-.*.s[a-w][a-z]
+*.s[a-w][a-z]
 *.un~
 Session.vim
 .netrwhist