SK_SUPPORT_LEGACY_DRAWFLTER typo

s/FLTER/FILTER/

R=reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1634573002

Review URL: https://codereview.chromium.org/1634573002
diff --git a/include/utils/SkNWayCanvas.h b/include/utils/SkNWayCanvas.h
index 35eca7b..d25dbc9 100644
--- a/include/utils/SkNWayCanvas.h
+++ b/include/utils/SkNWayCanvas.h
@@ -24,7 +24,7 @@
     ///////////////////////////////////////////////////////////////////////////
     // These are forwarded to the N canvases we're referencing
 
-#ifdef SK_SUPPORT_LEGACY_DRAWFLTER
+#ifdef SK_SUPPORT_LEGACY_DRAWFILTER
     SkDrawFilter* setDrawFilter(SkDrawFilter*) override;
 #endif