Remove unused gSavedAge (#21410)

* Remove the unused SavedAge variable.

src/openrct2/GameState.cpp

@@ -369,7 +369,6 @@ void GameState::UpdateLogic()
     NetworkFlush();
 
     gameState.CurrentTicks++;
-    gSavedAge++;
 
 #ifdef ENABLE_SCRIPTING
     auto& hookEngine = GetContext()->GetScriptEngine().GetHookEngine();

src/openrct2/entity/EntityRegistry.cpp

@@ -171,8 +171,6 @@ const std::list<EntityId>& GetEntityList(const EntityType id)
  */
 void ResetAllEntities()
 {
-    gSavedAge = 0;
-
     // Free all associated Entity pointers prior to zeroing memory
     for (int32_t i = 0; i < MAX_ENTITIES; ++i)
     {

src/openrct2/rct2/RCT2.h

@@ -988,7 +988,7 @@ namespace RCT2
         char CustomStrings[Limits::MaxUserStrings][Limits::MaxUserStringLength];
         uint32_t GameTicks1;
         Ride Rides[Limits::MaxRidesInPark];
-        uint16_t SavedAge;
+        uint16_t SavedAge; // unused
         int16_t SavedViewX;
         int16_t SavedViewY;
         uint8_t SavedViewZoom;

src/openrct2/rct2/S6Importer.cpp

@@ -440,7 +440,6 @@ namespace RCT2
 
             ImportRides();
 
-            gSavedAge = _s6.SavedAge;
             gSavedView = ScreenCoordsXY{ _s6.SavedViewX, _s6.SavedViewY };
             gSavedViewZoom = ZoomLevel{ static_cast<int8_t>(_s6.SavedViewZoom) };
             gSavedViewRotation = _s6.SavedViewRotation;

src/openrct2/scenario/Scenario.cpp

@@ -69,7 +69,6 @@ const StringId ScenarioCategoryStringIds[SCENARIO_CATEGORY_COUNT] = {
 
 std::string gScenarioSavePath;
 bool gFirstTimeSaving = true;
-uint16_t gSavedAge;
 uint32_t gLastAutoSaveUpdate = 0;
 
 bool gAllowEarlyCompletionInNetworkPlay;

src/openrct2/scenario/Scenario.h

@@ -162,7 +162,6 @@ extern bool gAllowEarlyCompletionInNetworkPlay;
 
 extern std::string gScenarioSavePath;
 extern bool gFirstTimeSaving;
-extern uint16_t gSavedAge;
 extern uint32_t gLastAutoSaveUpdate;
 
 extern std::string gScenarioFileName;

src/openrct2/title/TitleScreen.cpp

@@ -184,8 +184,6 @@ void TitleScreen::Tick()
     ContextUpdateMapTooltip();
     WindowDispatchUpdateAll();
 
-    gSavedAge++;
-
     ContextHandleInput();
 
     gInUpdateCode = false;