Minor: Clean up array test

[alamb]

Which issue does this PR close?

re: #3115

Rationale for this change

This test uses an older style of comparison because it was waiting on an upstream fix in arrow

What changes are included in this PR?

Chang the test to Use the same style as the rest of the tests

Are there any user-facing changes?

No

[codecov-commenter]

Codecov Report

Merging #3121 (91cf109) into master (b1765f7) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@ Coverage Diff @@## master #3121 +/- ##
==========================================
- Coverage 85.95% 85.94% -0.02% 
==========================================
Files 291 291 Lines 52382 52378 -4 ==========================================
- Hits 45025 45016 -9 - Misses 7357 7362 +5 

Impacted Files	Coverage Δ
datafusion/core/tests/sql/functions.rs	100.00% <100.00%> (ø)
datafusion/core/tests/sql/mod.rs	96.94% <0.00%> (-0.85%)	⬇️
datafusion/expr/src/logical_plan/plan.rs	77.77% <0.00%> (ø)

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[ursabot]

Benchmark runs are scheduled for baseline = 48f9b7a and contender = ff53f8b. ff53f8b is a master commit associated with this PR. Results will be available as each benchmark for each run completes.
Conbench compare runs links:
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ec2-t3-xlarge-us-east-2] ec2-t3-xlarge-us-east-2
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on test-mac-arm] test-mac-arm
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ursa-i9-9960x] ursa-i9-9960x
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ursa-thinkcentre-m75q] ursa-thinkcentre-m75q
Buildkite builds:
Supported benchmarks:
ec2-t3-xlarge-us-east-2: Supported benchmark langs: Python, R. Runs only benchmarks with cloud = True
test-mac-arm: Supported benchmark langs: C++, Python, R
ursa-i9-9960x: Supported benchmark langs: Python, R, JavaScript
ursa-thinkcentre-m75q: Supported benchmark langs: C++, Java