… into delete_screenshot

… that can be parametrized given Actions callback

This way each modal can have its own independent callback (and we don't broadcast).

See how register Async is moved into the childrens.

General thinking, we had:
S1(DS1) -> onDelete() --> DS1.delete --> DS1.success --> A.onDeleteSuccess --> S1.onDeleteSuccess
                                                                           --> S2.onDeleteSuccess
S2(DS1) -> onDelete() --> DS1.delete --> DS1.success --> A.onDeleteSuccess --> S1.onDeleteSuccess
                                                                           --> S2.onDeleteSuccess

we want:

S1(DS1) -> onDelete() --> DS1.delete --> DS1.success --> A1.onDeleteSuccess --> S1.onDeleteSuccess
S2(DS2) -> onDelete() --> DS2.delete --> DS2.success --> A2.onDeleteSuccess --> S2.onDeleteSuccess

--> DS1 must be replaced from singleton to parametrized class with action