Reduce condition

[nepridumalnik]

---

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[apolukhin]

Fails to compile with message

/home/runner/work/userver/userver/otlp/src/otlp/logs/logger.cpp:233:31: error: invalid operands to binary expression ('const SinkType' and 'userver_ns::otlp::SinkType')
  233 |         if (config_.logs_sink & SinkType::kOtlp) {
      |             ~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~
/home/runner/work/userver/userver/otlp/src/otlp/logs/logger.cpp:236:34: error: invalid operands to binary expression ('const SinkType' and 'userver_ns::otlp::SinkType')
  236 |         if (config_.tracing_sink & SinkType::kOtlp) {
      |             ~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~
2 errors generated.

[nepridumalnik]

Added static_cast to fix