Should not log stack with value_time_lock_not_found if config is set to not use value time lock.

Currently the bitcoin service logs an non-critical event if value time lock is not configured as if something bad happened:

{ Error: {"code":"value_time_lock_not_found"}
at BitcoinProcessor.getActiveValueTimeLockForThisNode (/datadrive/ion/node_modules/@decentralized-identity/sidetree/dist/lib/bitcoin/BitcoinProcessor.js:250:19)
at Object. (/datadrive/ion/dist/src/bitcoin.js:105:106)
at Generator.next ()
at /datadrive/ion/dist/src/bitcoin.js:7:71
at new Promise ()
at __awaiter (/datadrive/ion/dist/src/bitcoin.js:3:12)
at requestHandler (/datadrive/ion/dist/src/bitcoin.js:105:34)
at /datadrive/ion/dist/src/bitcoin.js:25:40
at Generator.next ()
at /datadrive/ion/dist/src/bitcoin.js:7:71 responseCode: 'not-found', code: 'value_time_lock_not_found' }