Fix multipleOf error message for fractional digits greater than 3

[justin-tay]

Closes #1209

Fixes the issue where the message for multipleOf was incorrect due to the precision for the number

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 77.88%. Comparing base (48ca3c2) to head (55c4d01).
⚠️ Report is 110 commits behind head on master.

Files with missing lines	Patch %	Lines
.../networknt/schema/keyword/MultipleOfValidator.java	50.00%	0 Missing and 1 partial ⚠️
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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1210      +/-   ##
============================================
- Coverage     78.90%   77.88%   -1.02%     
+ Complexity     1965     1926      -39     
============================================
  Files           172      200      +28     
  Lines          6352     6770     +418     
  Branches       1255     1191      -64     
============================================
+ Hits           5012     5273     +261     
- Misses          867     1054     +187     
+ Partials        473      443      -30     

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