server: fix updateWaitConditions when wait condition without processes

[brig]

ConcurrentProcessFilter adds an exclusive wait condition to the process,
transitions the process from ENQUEUED -> WAITING, and marks it with PROCESS_WAIT_CONDITIONS.IS_WAITING=true.

ProcessWaitWatchdog processes the exclusive wait condition first, transitions the process from WAITING -> ENQUEUED,
and marks it with PROCESS_WAIT_CONDITIONS.IS_WAITING=false.

This is a symmetric action. As a result, the process will return to the state it was in.

If the process has PROCESS_WAIT_CONDITIONS.IS_WAITING=true and does not have an exclusive wait condition,
for example, if the process is waiting for a child to finish,
then the process will be in the SUSPENDED state.
When the wait condition is met, the process will be resumed and transition from SUSPENDED -> RESUMING -> ENQUEUED
with PROCESS_WAIT_CONDITIONS.IS_WAITING=false