Vulkan: Fix resource leaks present at shutdown and mode changes

Infrequent, but still happened.

Source/Core/VideoBackends/Vulkan/Renderer.cpp

@@ -61,6 +61,8 @@ Renderer::~Renderer()
 {
   g_Config.bRunning = false;
   UpdateActiveConfig();
+  DestroyScreenshotResources();
+  DestroyShaders();
   DestroySemaphores();
 }