fix incorrect context

[sokra]

fixes bug accidentally merged in #70

[realityking]

I don't think this was #70, looks like this line was last changed in 1baaa86

[sokra]

yep, bug was introduced earlier, strict mode discovered the problem

[codecov]

Codecov Report

Merging #76 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #76   +/-   ##
======================================
  Coverage    95.5%   95.5%           
======================================
  Files           3       3           
  Lines         356     356           
  Branches       94      94           
======================================
  Hits          340     340           
  Misses         16      16

Impacted Files	Coverage Δ
lib/DirectoryWatcher.js	95.41% <ø> (ø)	⬆️
lib/watchpack.js	94.89% <0%> (ø)	⬆️
lib/watcherManager.js	100% <0%> (ø)	⬆️

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