[rust] Add missing dependencies for Rust targets

GN currently passes transitive rlib dependencies so these work. New GN
version will not do this.

Change-Id: I10c92c62775ced97e63f69834809ae634a153333
diff --git a/session_shells/ermine/session/BUILD.gn b/session_shells/ermine/session/BUILD.gn
index 099429c..bf7fe26 100644
--- a/session_shells/ermine/session/BUILD.gn
+++ b/session_shells/ermine/session/BUILD.gn
@@ -25,6 +25,7 @@
     "//sdk/fidl/fuchsia.ui.input2:fuchsia.ui.input2-rustc",
     "//sdk/fidl/fuchsia.ui.policy:fuchsia.ui.policy-rustc",
     "//sdk/fidl/fuchsia.ui.scenic:fuchsia.ui.scenic-rustc",
+    "//sdk/fidl/fuchsia.ui.shortcut:fuchsia.ui.shortcut-rustc",
     "//sdk/fidl/fuchsia.ui.views:fuchsia.ui.views-rustc",
     "//src/lib/fidl/rust/fidl",
     "//src/lib/fuchsia-async",