Drop save compat hacks.

The CAS flight plan tweaks break save compat in a way that's not as easy
to fix. Accept it and drop the existing hacks since they won't be useful
any more.

game/ato/flight.py

@@ -12,7 +12,6 @@ from .flightmembers import FlightMembers
 from .flightroster import FlightRoster
 from .flightstate import FlightState, Navigating, Uninitialized
 from .flightstate.killed import Killed
-from ..savecompat import has_save_compat_for
 from ..sidc import (
     Entity,
     SidcDescribable,
@@ -108,14 +107,9 @@ class Flight(SidcDescribable):
         del state["state"]
         return state
 
-    @has_save_compat_for(9)
     def __setstate__(self, state: dict[str, Any]) -> None:
         state["state"] = Uninitialized(self, state["squadron"].settings)
-        if "use_same_loadout_for_all_members" not in state:
-            state["use_same_loadout_for_all_members"] = True
         self.__dict__.update(state)
-        if isinstance(self.roster, FlightRoster):
-            self.roster = FlightMembers.from_roster(self, self.roster)
 
     @property
     def blue(self) -> bool:

game/ato/flightmember.py

@@ -1,10 +1,9 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING, Any
+from typing import TYPE_CHECKING
 
 from game.ato.loadouts import Loadout
 from game.lasercodes import LaserCode
-from game.savecompat import has_save_compat_for
 
 if TYPE_CHECKING:
     from game.squadrons import Pilot
@@ -19,14 +18,6 @@ class FlightMember:
         self.weapon_laser_code: LaserCode | None = None
         self.properties: dict[str, bool | float | int] = {}
 
-    @has_save_compat_for(9)
-    def __setstate__(self, state: dict[str, Any]) -> None:
-        if "tgp_laser_code" not in state:
-            state["tgp_laser_code"] = None
-        if "weapon_laser_code" not in state:
-            state["weapon_laser_code"] = None
-        self.__dict__.update(state)
-
     def assign_tgp_laser_code(self, code: LaserCode) -> None:
         if self.tgp_laser_code is not None:
             raise RuntimeError(