Initialize fGammaCorrect in DF Path Renderer unit test

TBR=jvanverth@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2157933003

Review-Url: https://codereview.chromium.org/2157933003
diff --git a/tests/DFPathRendererTest.cpp b/tests/DFPathRendererTest.cpp
index a616399..ad6e022 100644
--- a/tests/DFPathRendererTest.cpp
+++ b/tests/DFPathRendererTest.cpp
@@ -54,7 +54,7 @@
     args.fViewMatrix = &matrix;
     args.fShape = &shape;
     args.fAntiAlias = true;
-
+    args.fGammaCorrect = false;
     pr->drawPath(args);
 }