vulkan: Don't select sRGB formats for swapchain

src/qt/qt_vulkanwindowrenderer.cpp

@@ -808,6 +808,7 @@ VulkanWindowRenderer::VulkanWindowRenderer(QWidget* parent)
     qDebug() << instance.layers();
     setVulkanInstance(&instance);
     setPhysicalDeviceIndex(0);
+    setPreferredColorFormats({VK_FORMAT_B8G8R8A8_UNORM, VK_FORMAT_R8G8B8A8_UNORM, VK_FORMAT_A8B8G8R8_UNORM_PACK32});
     setFlags(Flag::PersistentResources);
     buf_usage = std::vector<std::atomic_flag>(1);
     buf_usage[0].clear();