[rust] update for the crate directory removal

Change-Id: I8aaaf369b85e4240df1d252609645389fefe4201
diff --git a/BUILD.gn b/BUILD.gn
index 7f4765d..8663ce4 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -12,8 +12,8 @@
   name = "rustyline"
   edition = "2015"
   deps = [
-    "//garnet/public/rust/crates/fuchsia-device",
-    "//garnet/public/rust/crates/fuchsia-zircon",
+    "//garnet/public/rust/fuchsia-device",
+    "//garnet/public/rust/fuchsia-zircon",
 
     "//third_party/rust-crates/rustc_deps:log",
     "//third_party/rust-crates/rustc_deps:libc",