Fixed nanoVG purple edge glitch

[Youlean]

void IGraphicsNanoVG::EndFrame()
{
  const float width = std::ceil(Width() * GetDrawScale());
  const float height = std::ceil(Height() * GetDrawScale());
  
  nvgEndFrame(mVG); // end main frame buffer update
  nvgBindFramebuffer(nullptr);
  nvgBeginFrame(mVG, width, height, GetScreenScale());
  
  NVGpaint img = nvgImagePattern(mVG, 0, 0, width, height, 0, mMainFrameBuffer->image, 1.0f);

  nvgSave(mVG);
  nvgResetTransform(mVG);
  nvgTranslate(mVG, mXTranslation, mYTranslation);
  nvgBeginPath(mVG);
  nvgRect(mVG, 0, 0, width, height);
  nvgFillPaint(mVG, img);
  nvgFill(mVG);
  nvgRestore(mVG);
  
#if defined OS_MAC && defined IGRAPHICS_GL
  glBindFramebuffer(GL_FRAMEBUFFER, mInitialFBO); // restore apple fbo
#endif

  nvgEndFrame(mVG);

#if defined IGRAPHICS_IMGUI && defined IGRAPHICS_GL
  if(mImGuiRenderer)
    mImGuiRenderer->NewFrame();
#endif
  
  mInDraw = false;
  ClearFBOStack();
}

This will fix the annoying purple glitch. (right edge here)