[flutter] Use the proper label to refer to libscenic.

Bug: DX-1068
Change-Id: I6efdca3446ea2c1d488efabd745f68cda4d330e9
diff --git a/runtime/flutter_runner/BUILD.gn b/runtime/flutter_runner/BUILD.gn
index f505436..15f94bd 100644
--- a/runtime/flutter_runner/BUILD.gn
+++ b/runtime/flutter_runner/BUILD.gn
@@ -136,9 +136,9 @@
              "//garnet/public/lib/icu_data/cpp",
              "//garnet/public/lib/svc/cpp",
              "//garnet/public/lib/ui/gfx/cpp",
-             "//garnet/public/lib/ui/scenic/cpp",
              "//garnet/public/lib/vulkan",
              "//sdk/fidl/fuchsia.modular",
+             "//sdk/lib/ui/scenic/cpp",
              "//third_party/dart/runtime/bin:libdart_builtin${product_suffix}",
              "//third_party/rapidjson",
              "//third_party/skia",