fix: correct errors when PGDATABASE envar is set

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Bencher

Report	Tue, June 18, 2024 at 15:31:02 UTC
Project	theseus-rs/postgresql-embedded
Branch	add-command-envars
Testbed	localhost

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Benchmark	Latency	Latency Results nanoseconds (ns)
extract	➖ (view plot)	157,790.00
lifecycle	➖ (view plot)	1,752,000,000.00

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Codecov Report

Attention: Patch coverage is 95.36680% with 12 lines in your changes missing coverage. Please review.

Project coverage is 99.42%. Comparing base (2c072bd) to head (567ba5f).

Files	Patch %	Lines
postgresql_commands/src/traits.rs	25.00%	12 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #76 +/- ## ========================================== - Coverage 99.53% 99.42% -0.12% ========================================== Files 58 59 +1 Lines 7533 7768 +235 ========================================== + Hits 7498 7723 +225 - Misses 35 45 +10 ```

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