Fix .bzl skottie_lib_hdrs

TBR=
Change-Id: Id50b30077045477e4a6b0dfef3b9d950ac8f40f7
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/212023
Reviewed-by: Florin Malita <fmalita@chromium.org>
Reviewed-by: Ben Wagner aka dogben <benjaminwagner@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
diff --git a/public.bzl b/public.bzl
index 417d766..4d14e64 100644
--- a/public.bzl
+++ b/public.bzl
@@ -669,7 +669,7 @@
 ################################################################################
 
 def skottie_lib_hdrs():
-    return native.glob("modules/skottie/include/*.h")
+    return native.glob(["modules/skottie/include/*.h"])
 
 def skottie_lib_srcs():
     return native.glob(