Fixes an include path (#36899)

Author: zanderso

lib/ui/painting/multi_frame_codec.cc

@@ -9,7 +9,7 @@
 #include "flutter/fml/make_copyable.h"
 #include "flutter/lib/ui/painting/image.h"
 #if IMPELLER_SUPPORTS_RENDERING
-#include "lib/ui/painting/image_decoder_impeller.h"
+#include "flutter/lib/ui/painting/image_decoder_impeller.h"
 #endif  // IMPELLER_SUPPORTS_RENDERING
 #include "third_party/dart/runtime/include/dart_api.h"
 #include "third_party/skia/include/core/SkPixelRef.h"