Deletes Vulkan resources on swapchain recreation

The change tries to minimize a memory peak during a window resizing.

Refs #6864

(cherry picked from commit de36c75023)
Signed-off-by: phosit <phosit@autistici.org>

source/renderer/backend/vulkan/Device.cpp

@@ -808,6 +808,11 @@ bool CDevice::AcquireNextBackbuffer()
 	{
 		vkDeviceWaitIdle(m_Device);
 
+		// Since we know there is no GPU work in progress we can free resources
+		// queued for deletion.
+		ProcessDeviceObjectToDestroyQueue(true);
+		ProcessObjectToDestroyQueue(true);
+
 		RecreateSwapChain();
 		if (!IsSwapChainValid())
 			return false;