Save player camera pos in memory instead of writting original file

The original behavior loaded the file, modified and saved back without
storing the camera in current mission in memory causing the saves
to not contain the new positions, now we simply leave the original file
alone unless is saved manually

Source/UserInterface/GameShell.cpp

@@ -2541,11 +2541,7 @@ void GameShell::rememberPlayerCamera(terPlayer* player, const char* triggerName)
 	if(universe()->activePlayer()->isWorld())
 		return;
 
-	SavePrm data;
-	if(!CurrentMission.loadMission(data))
-		return;
-	data.manualData.saveCamera(player->playerStrategyIndex(), triggerName);
-	CurrentMission.saveMission(data, false);
+    savePrm().manualData.saveCamera(player->playerStrategyIndex(), triggerName);
 }
 
 void GameShell::setCountDownTime(int timeLeft) {