chore(fix): fix region tag

[y4nben]

replace incorrect region tag in the sample code.

To facilitate adding back the sample called out in: b/377557203

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• samples/generated_samples/logging_v2_generated_logging_service_v2_tail_log_entries_sync.py:26, tag logging_tail_log_entries

You are about to delete 1 region tag.

• samples/generated_samples/logging_v2_generated_logging_service_v2_tail_log_entries_sync.py:26, tag logging_v2_generated_LoggingServiceV2_TailLogEntries_sync

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