Fix Windows FileStore updating

[dbwiddis]

Fixes #1138

[coveralls]

Coverage remained the same at 79.206% when pulling ba19729 on dbwiddis:winfsbug into 480117c on oshi:master.

[codecov]

Codecov Report

Merging #1139 into master will increase coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1139      +/-   ##
============================================
+ Coverage     75.16%   75.21%   +0.05%     
  Complexity        2        2              
============================================
  Files            31       31              
  Lines          1385     1384       -1     
  Branches        170      169       -1     
============================================
  Hits           1041     1041              
+ Misses          267      266       -1     
  Partials         77       77              

Impacted Files	Coverage Δ	Complexity Δ
...i-demo/src/main/java/oshi/demo/OshiHTTPServer.java	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)

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