Remove safety check (revert ebcce19)

Since this just fails silently without side effects with the current custom Vector copy-assignment operator the check can be removed
This crashing when we eventually switch to using the default copy-assignment operator will serve as an immediate reminder to fix it

Author: MaximDude

Entities/Activity.cpp

@@ -286,12 +286,9 @@ void Activity::Clear() {
 
 		// Intentionally doing all players, all need controllers
 		for (short player = Players::PlayerOne; player < Players::MaxPlayerCount; ++player) {
-			const short playerScreen = ScreenOfPlayer(player);
 			m_ViewState[player] = ViewState::Normal;
-			g_FrameMan.ClearScreenText(playerScreen);
-			if (playerScreen >= 0) {
-				g_SceneMan.SetScreenOcclusion(Vector(), playerScreen);
-			}
+			g_FrameMan.ClearScreenText(ScreenOfPlayer(player));
+			g_SceneMan.SetScreenOcclusion(Vector(), ScreenOfPlayer(player));
 
 			m_PlayerController[player].Destroy();
 			m_PlayerController[player].Create(Controller::CIM_PLAYER, player);