Use correct command-line option.

Test: TreeHugger
Change-Id: I57823b93d1fb0b7d2ee6889ece22d12eff712279
diff --git a/Android.bp b/Android.bp
index 9336c24..f21a06e 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,4 +1,4 @@
-// This file is generated by cargo2android.py --device --run --dependencies --test.
+// This file is generated by cargo2android.py --device --run --dependencies --tests.
 
 package {
     default_applicable_licenses: ["external_rust_crates_lru-cache_license"],