Fix syntax error at postgress database script

[aaujayasena]

Proposed changes in this pull request

Fixed a syntax error in the PostgreSQL script for creating the IDN_RULE table.

When should this PR be merged

Once the fix is reviewed and validated

Follow up actions

Test the database script execution on supported PostgreSQL versions.
Related issue: wso2/product-is#22128

Checklist (for reviewing)

General

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.70%. Comparing base (f70492e) to head (f70ccd8).
Report is 10 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##             master    #6249    +/-   ##
==========================================
  Coverage     45.69%   45.70%            
+ Complexity    14078    14059    -19     
==========================================
  Files          1633     1633            
  Lines        100914   100656   -258     
  Branches      17730    17696    -34     
==========================================
- Hits          46117    46004   -113     
+ Misses        48080    47956   -124     
+ Partials       6717     6696    -21     

Flag	Coverage Δ
unit	28.40% <ø> (+<0.01%)	⬆️

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