fix: 截图后自动退出，添加 compare_ppm.py

tests/D3D12/main.cpp

@@ -973,6 +973,7 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 				} else {
 					Log("[DEBUG] Failed to save screenshot!\n");
 				}
+				PostQuitMessage(0);
 			}
 		}
 	}