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/MatrixTest.cpp b/tests/MatrixTest.cpp
index f08613f..1399bf2 100644
--- a/tests/MatrixTest.cpp
+++ b/tests/MatrixTest.cpp
@@ -93,10 +93,10 @@
     SkMatrix m;
     m.reset();
     assert9(reporter, m, 1, 0, 0, 0, 1, 0, 0, 0, 1);
-    
+
     m.setScale(2, 3);
     assert9(reporter, m, 2, 0, 0, 0, 3, 0, 0, 0, 1);
-    
+
     m.postTranslate(4, 5);
     assert9(reporter, m, 2, 0, 4, 0, 3, 5, 0, 0, 1);