Fix bugs in adaptivity computation

[IshaanDesai]

The following bugs are fixed:

• The step of updating inactive simulations did not take the correct states from the previous step of updating active simulations.
• If a situation arises that all the simulations are exactly the same in terms of their output, and all of them are active, the global adaptivity implementation fails to compare them and deactivate all but one simulation. This PR adds functionality to handle this scenario. This can typically happen at the start of a simulation.