Enable root refresh on "vim ." a different way than #999. #1001
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Fixes #1000.
Reverts #999.
Fixes #897 (comment) a different way.
Instead of assigning a value to t:NERDTreeBufName for a window tree,
which is used to determine if NERDTree is open, simply also look at the
current buffer's name to see if it matches the NERDTree pattern.