Fix broken intro and crash when resizing window

VCMI created a texture with the height of the original intro video, and the aspect ratio of the actual VCMI window.
This resulted in a texture with a width greater than 16384 px.

Fixes vcmi#3200

client/renderSDL/ScreenHandler.cpp

@@ -311,7 +311,7 @@ void ScreenHandler::initializeScreenBuffers()
 	int amask = 0xFF000000;
 #endif
 
-	auto logicalSize = getPreferredLogicalResolution();
+	auto logicalSize = getPreferredWindowResolution();
 	SDL_RenderSetLogicalSize(mainRenderer, logicalSize.x, logicalSize.y);
 
 	screen = SDL_CreateRGBSurface(0, logicalSize.x, logicalSize.y, 32, rmask, gmask, bmask, amask);