Fix a typo in CPDF_ImageRenderer::StartRenderDIBBase().

Regressed in https://pdfium.googlesource.com/pdfium/+/b8b52b46, found by
manual inspection on
https://groups.google.com/d/topic/pdfium/XJ0_YubtFmQ/discussion ?

Change-Id: Ic59f0dc4fc40fd40597938784498a92e4e7343ba
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/54630
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/core/fpdfapi/render/cpdf_imagerenderer.cpp b/core/fpdfapi/render/cpdf_imagerenderer.cpp
index d873aa8..877a907 100644
--- a/core/fpdfapi/render/cpdf_imagerenderer.cpp
+++ b/core/fpdfapi/render/cpdf_imagerenderer.cpp
@@ -112,7 +112,7 @@
   m_ResampleOptions = FXDIB_ResampleOptions();
   if (GetRenderOptions().GetOptions().bForceDownsample)
     m_ResampleOptions.bInterpolateDownsample = true;
-  else if (GetRenderOptions().GetOptions().bForceDownsample)
+  else if (GetRenderOptions().GetOptions().bForceHalftone)
     m_ResampleOptions.bHalftone = true;
 
   if (m_pRenderStatus->GetRenderDevice()->GetDeviceClass() != FXDC_DISPLAY)