Make the Vulkan GPU log profiler a runtime developer setting.

I keep forgetting to disable the define on commit, this is a better
solution.

Core/Config.cpp

@@ -916,6 +916,7 @@ static ConfigSetting graphicsSettings[] = {
 	ConfigSetting("RenderDuplicateFrames", &g_Config.bRenderDuplicateFrames, false, true, true),
 
 	ConfigSetting("ShaderCache", &g_Config.bShaderCache, true, false, false),  // Doesn't save. Ini-only.
+	ConfigSetting("GpuLogProfiler", &g_Config.bGpuLogProfiler, false, true, false),
 
 	ConfigSetting(false),
 };