Resolves #2759: Don't run mergeLosesLockTest with 0% failure rate

[ScottDugas]

a 0% failure rate doesn't really make sense for this test

[foundationdb-ci]

Result of fdb-record-layer-pr on Linux CentOS 7

• Commit ID: 7240807369c0f47671459ef180ffd58b7453d23a
• Duration 0:52:21
• Result: :white_check_mark: SUCCEEDED
• Error: N/A
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)