chore: fix lint failure in list example (#4520)

kara · web-flow · commit 2d551e97e2ed · 2017-05-12T15:00:17.000-07:00
diff --git a/src/material-examples/list-sections/list-sections-example.css b/src/material-examples/list-sections/list-sections-example.css
@@ -1,3 +1,3 @@
 .mat-list-icon {
-  color: rgba(0,0,0,0.54);
-}
+  color: rgba(0, 0, 0, 0.54);
+}
