Fix #21208: Error messages disappear too quickly if the game runs for a while (#21394)

* Reset gCurrentRealTimeTicks when the map is initialized

* Use 32 bit for gWindowUpdateTicks

* Update changelog.txt

src/openrct2/Game.cpp

@@ -542,6 +542,7 @@ void GameLoadInit()
     ContextBroadcastIntent(&intent);
 
     gWindowUpdateTicks = 0;
+    gCurrentRealTimeTicks = 0;
 
     LoadPalette();
 

src/openrct2/interface/Window.cpp

@@ -49,7 +49,7 @@ int32_t gTextBoxFrameNo = 0;
 bool gUsingWidgetTextBox = false;
 TextInputSession* gTextInput;
 
-uint16_t gWindowUpdateTicks;
+uint32_t gWindowUpdateTicks;
 uint16_t gWindowMapFlashingFlags;
 colour_t gCurrentWindowColours[4];
 

src/openrct2/interface/Window.h

@@ -480,7 +480,7 @@ using close_callback = void (*)();
 
 extern WindowBase* gWindowAudioExclusive;
 
-extern uint16_t gWindowUpdateTicks;
+extern uint32_t gWindowUpdateTicks;
 namespace MapFlashingFlags
 {
     constexpr uint16_t GuestListOpen = (1 << 0);