GH-63 Fix a bug preventing from saving planet update results
GH-63 Fix a bug preventing from saving planet update results

Research queue handler would check the structures queue,
determine that the lab upgrade has been finished,
however the planet update would not be persisted.

The bug was not critical, although it would lead to spammy messages
about "not being able to finish lab upgrade" on every Lab page refresh).

mdziekon/UniEngine,mdziekon/UniEngine,mdziekon/UniEngine