Initialize Deglitcher to "now"

[armanbilge]

One last fix. The monotonic clock typically starts at 0 on JS, but this is not guaranteed in general. So better to initialize it with the current time.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (015f528) 78.15% compared to head (2810181) 78.34%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #569      +/-   ##
==========================================
+ Coverage   78.15%   78.34%   +0.18%     
==========================================
  Files           8        8              
  Lines         444      434      -10     
  Branches        1        2       +1     
==========================================
- Hits          347      340       -7     
+ Misses         97       94       -3     

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