Style bikeshed - remove extraneous whitespace

GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1842753002

Review URL: https://codereview.chromium.org/1842753002
diff --git a/tests/CanvasTest.cpp b/tests/CanvasTest.cpp
index 05ce604..02b875e 100644
--- a/tests/CanvasTest.cpp
+++ b/tests/CanvasTest.cpp
@@ -700,7 +700,7 @@
     n = canvas.saveLayer(nullptr, nullptr);
     REPORTER_ASSERT(reporter, 2 == n);
     REPORTER_ASSERT(reporter, 3 == canvas.getSaveCount());
-    
+
     canvas.restore();
     REPORTER_ASSERT(reporter, 2 == canvas.getSaveCount());
     canvas.restore();