Fix `DatabaseManagerTest.cpp` build error on non-closed brackets which was discovered during the new builds:
```
DatabaseManagerTest.cpp:185:80: error: expected ')'
[build] "mobile:EMQNoQ7b2ueEmQ4QsevRWlXxFCNt055y20T1PHdoYAQRt0S6TLzZWNM6XSvdWqxm";
```
Linear task: [[ https://linear.app/comm/issue/ENG-1067/fix-tunnelbroker-databasemanagertestcpp-build-error | ENG-1067 ]]