Fix #14256, dfd9fbf873: Company finance windows not updated when paused. (#14258)

Refresh company finance windows via a WindowTimer instead of in game loop.

As the invalidation affects multiple windows this is a global timer instead of window-specific.

src/openttd.cpp

@@ -1244,7 +1244,6 @@ void StateGameLoop()
 
 		CallWindowGameTickEvent();
 		NewsLoop();
-		InvalidateCompanyWindows();
 	} else {
 		if (_debug_desync_level > 2 && TimerGameEconomy::date_fract == 0 && (TimerGameEconomy::date.base() & 0x1F) == 0) {
 			/* Save the desync savegame if needed. */
@@ -1281,7 +1280,6 @@ void StateGameLoop()
 
 		CallWindowGameTickEvent();
 		NewsLoop();
-		InvalidateCompanyWindows();
 		cur_company.Restore();
 	}