Glob does not pick up with correct casing if [] is removed.

[karthiknadig]

Fixes #817

[karthiknadig]

@int19h Looks like glob does not pick up the dirs with proper casing if the pattern does not have any matching requirements. adding [<last char>] forces matching, and it gets the correct casing.

[codecov-io]

Codecov Report

Merging #818 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master     #818   +/-   ##
=======================================
  Coverage   59.42%   59.42%           
=======================================
  Files          28       28           
  Lines        3914     3914           
=======================================
  Hits         2326     2326           
  Misses       1588     1588

Impacted Files	Coverage Δ
ptvsd/pathutils.py	41.86% <0%> (ø)	⬆️

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