Simplify multiple primary key quoting

[ntzm]

No description provided.

[codecov-io]

Codecov Report

Merging #1214 into master will decrease coverage by 0.01%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##           master    #1214      +/-   ##
==========================================
- Coverage   72.18%   72.17%   -0.02%     
==========================================
  Files          35       35              
  Lines        5584     5553      -31     
==========================================
- Hits         4031     4008      -23     
+ Misses       1553     1545       -8

Impacted Files	Coverage Δ
src/Phinx/Db/Adapter/SqlServerAdapter.php	0% <0%> (ø)	⬆️
src/Phinx/Db/Adapter/PostgresAdapter.php	92.69% <100%> (-0.1%)	⬇️
src/Phinx/Db/Adapter/MysqlAdapter.php	97.81% <100%> (-0.03%)	⬇️
src/Phinx/Db/Adapter/SQLiteAdapter.php	86.5% <100%> (-0.15%)	⬇️

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