[Backport 1.7.latest] Fix the semicolon semantics for indexes while respecting other bug fix

[mikealfare]

Backport dbt-labs/dbt-postgres#97

[jtcohen6]

Thanks @mikealfare! Approving this backport, pending all tests passing

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.67%. Comparing base (d0ddeea) to head (626ab12).

Additional details and impacted files

@@              Coverage Diff               @@
##           1.7.latest   #10194      +/-   ##
==============================================
+ Coverage       86.64%   86.67%   +0.02%     
==============================================
  Files             179      179              
  Lines           26722    26722              
==============================================
+ Hits            23153    23161       +8     
+ Misses           3569     3561       -8     

Flag	Coverage Δ
integration	83.58% <ø> (+0.09%)	⬆️
unit	65.06% <ø> (ø)

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[mikealfare]

Given this PR amounts to moving semicolons around in jinja and adding a test, that the error on the Artifact Schema Check appears to be a permissions error, and that the failed check is also not required, I am going to merge acknowledging and accepting the failed check.