Fix message

[justin-tay]

This fixes the use of message in a validator. Currently this always gets overridden.

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (bc93b44) 78.75% compared to head (576c656) 78.75%.

Files	Patch %	Lines
...tworknt/schema/MessageSourceValidationMessage.java	50.00%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff            @@
##             master     #975   +/-   ##
=========================================
  Coverage     78.75%   78.75%           
- Complexity     1850     1851    +1     
=========================================
  Files           164      164           
  Lines          5987     5988    +1     
  Branches       1146     1147    +1     
=========================================
+ Hits           4715     4716    +1     
+ Misses          837      836    -1     
- Partials        435      436    +1     

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