fix default value for span_compression_exact_match_max_duration

[beniwohli]

see https://github.com/elastic/apm/blob/5e1bfbc95fa0358ef195cedba8cb1be281988227/specs/agents/handling-huge-traces/tracing-spans-compress.md#configuration-option-span_compression_exact_match_max_duration

[ghost]

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• Start Time: 2021-11-17T13:18:05.185+0000

• Duration: 33 min 4 sec

• Commit: 5ff930e

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