Fix DEFAULT_EPSILON_s visiblity

[darbyjohnston]

Fixes #2004

Make DEFAULT_EPSILON_s inline so that it is visible by default.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.14%. Comparing base (267fe4b) to head (4c970be).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2005   +/-   ##
=======================================
  Coverage   85.14%   85.14%           
=======================================
  Files         181      181           
  Lines       12780    12780           
  Branches     1206     1206           
=======================================
  Hits        10882    10882           
  Misses       1715     1715           
  Partials      183      183           

Flag	Coverage Δ
py-unittests	85.14% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/opentime/timeRange.h	98.38% <ø> (ø)

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