Do not patch scheduleEntries if they didn't change

[BacLuc]

If you add a schedule entry here:

you might overwrite changes of other users on the existing scheduleentry.

Its an edge case, but when we have no other issues, we can fix this.

Maybe we want to solve this generally in the form component, that can determine which fields of which entities are dirty, and only patch them.

[manuelmeister]

Core Meeting Discuss

We are not sure what we want here.