Increase reward for Castrum Meridianum in Main Scenario Roulette to match the effort

[axemtitanium]

since Castrum takes half the time of Praetorium (CM is ~35 minutes; Praetorium is nearly an hour), it would make sense for you to get half the experience for it.

It was already increased with Patch 4.2:

To ensure new players are able to enjoy the cutscenes in Castrum Meridianum and the Praetorium, all cutscenes in these dungeons can no longer be skipped.
Because this will increase the time required to complete these dungeons, completion rewards and Duty Roulette bonuses for these duties have been increased.

With the unskippable cutscenes, Castrum now takes at least 35 min, but Praetorium is only a little slower at 45 min so it doesn't make sense for Castrum to only give half the exp of Praetorium. Even with the unskippable cutscenes, Praetorium never takes an hour in my experience. It's actually very consistently around that time now and there's very little you can do to speed it up or slow it down, unlike Castrum which can suffer from a variety of slowdowns.