More sprintf and warning cleanup (#3540)

Co-authored-by: cold-brewed <cold-brewed@users.noreply.github.com>

src/qt/qt_vulkanrenderer.cpp

@@ -938,9 +938,6 @@ VulkanRenderer2::startNextFrame()
     if (err != VK_SUCCESS)
         qFatal("Failed to map memory: %d", err);
     QMatrix4x4 m = m_proj;
-#if 0
-    m.rotate(m_rotation, 0, 0, 1);
-#endif
     memcpy(p, m.constData(), 16 * sizeof(float));
     m_devFuncs->vkUnmapMemory(dev, m_bufMem);
     p = nullptr;