Fix JSConversionTest >> #testDateAndTime in GemStone 3.7.5.

[kurtkilpela]

Ensure seconds is rendered as an integer.

DateAndTime instances in GemStone/S 3.7.5 will include fractional results for #second. Pharo and prior versions of GemStone/S return integer values.

This change fixes JSConversionTest >> #testDateAndTime in GemStone 3.7.5.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.91%. Comparing base (1e1775c) to head (f8adb52).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1514      +/-   ##
==========================================
+ Coverage   52.28%   52.91%   +0.62%     
==========================================
  Files        9350     9202     -148     
  Lines       77740    76778     -962     
==========================================
- Hits        40649    40626      -23     
+ Misses      37091    36152     -939     

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