Remove unnecessary condition else check

[Akanksha-kedia]

Description

Eliminate unneeded else condition check

Motivation and Context

Streamlining and eliminating superfluous if-else conditions.

Impact

No impact, just removal of extraneous elements.

Test Plan

Execute unit tests in presto-main and verify castToTimestamp and castToTime scenarios.

Contributor checklist

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• PR description addresses the issue accurately and concisely. If the change is non-trivial, a GitHub Issue is referenced.
• Documented new properties (with its default value), SQL syntax, functions, or other functionality.
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Release Notes

Please follow release notes guidelines and fill in the release notes below.

== RELEASE NOTES ==

Remove unnecessary condition else check

[Akanksha-kedia]

2023-11-21T00:20:32.223-0600 WARN TestNG-test=Surefire test-1 org.eclipse.jetty.util.thread.QueuedThreadPool QueuedThreadPool[http-worker]@5fbaf2de{STOPPING,2<=20<=200,i=0,q=12}[org.eclipse.jetty.util.thread.TryExecutor$$Lambda$280/1814466511@18707d06] Couldn't stop Thread[http-worker-59,5,main]
[INFO] Tests run: 158, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 373.087 s - in com.facebook.presto.hive.TestHiveDistributedJoinQueries
[INFO]
[INFO] Results:
[INFO]
[INFO] Tests run: 158, Failures: 0, Errors: 0, Skipped: 0
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------

[Akanksha-kedia]

2023-11-21T00:58:06.843-0600 WARN TestNG-test=Surefire test-1 com.facebook.presto.testng.services.LogTestDurationListener Tests from com.facebook.presto.verifier.framework.TestDataVerification took 1.88m
[INFO] Tests run: 180, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 236.171 s - in TestSuite
[INFO]
[INFO] Results:
[INFO]
[INFO] Tests run: 180, Failures: 0, Errors: 0, Skipped: 0
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 04:38 min

[Akanksha-kedia]

@tdcmeehan please review

[Akanksha-kedia]

@tdcmeehan please helpt o review