[gn] Format all BUILD.gn files

Change-Id: Ib4ae46ba0f80c6dd96bb6d163aef30a1fdf82bd8
diff --git a/libutil/BUILD.gn b/libutil/BUILD.gn
index 2e53a0a..2cbda26 100644
--- a/libutil/BUILD.gn
+++ b/libutil/BUILD.gn
@@ -48,7 +48,5 @@
     "unescape.c",
   ]
 
-  configs += [
-    ":libutil_config",
-  ]
+  configs += [ ":libutil_config" ]
 }