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/GradientTest.cpp b/tests/GradientTest.cpp
index 0014089..ac55d99 100644
--- a/tests/GradientTest.cpp
+++ b/tests/GradientTest.cpp
@@ -34,7 +34,7 @@
     SkMatrix matrix;
     matrix.setAffine(affine);
     c.concat(matrix);
-    
+
     c.drawPaint(paint);
 }