Fix Confluence notifications dropdown

The user notifications dropdown returns an error:

Cause

java.lang.RuntimeException: java.util.concurrent.TimeoutException
    at com.google.common.base.Throwables.propagate(Throwables.java:241)

caused by: java.util.concurrent.TimeoutException
    at com.atlassian.mywork.host.util.concurrent.LockedTaskExecutor.tryExecuteUnderLock(LockedTaskExecutor.java:55)

Stack Trace:[hide]

java.lang.RuntimeException: java.util.concurrent.TimeoutException at com.google.common.base.Throwables.propagate(Throwables.java:241) at com.atlassian.mywork.host.util.concurrent.LockedTaskExecutor.executeUnderLock(LockedTaskExecutor.java:106) at com.atlassian.mywork.host.service.LocalRegistrationServiceImpl.getLastModified(LocalRegistrationServiceImpl.java:192) at com.atlassian.mywork.host.service.LocalRegistrationServiceImpl.getCacheValue(LocalRegistrationServiceImpl.java:223)
...
Caused by: java.util.concurrent.TimeoutException
at com.atlassian.mywork.host.util.concurrent.LockedTaskExecutor.tryExecuteUnderLock(LockedTaskExecutor.java:55)
at com.atlassian.mywork.host.util.concurrent.LockedTaskExecutor.executeUnderLock(LockedTaskExecutor.java:96)
... 318 more