Make "pub run foo" run "pub run foo:foo" rather than "pub run bin/foo"

sdk/lib/_internal/pub/test/run/runs_app_in_entrypoint_test.dart

Index: sdk/lib/_internal/pub/test/run/runs_app_in_entrypoint_test.dart
diff --git a/sdk/lib/_internal/pub/test/run/runs_app_in_entrypoint_test.dart b/sdk/lib/_internal/pub/test/run/runs_app_in_entrypoint_test.dart
index e3cb233f8634b569adf10d2b57c82f082ae93fa2..2aaaa297ad511d7b442ca3e088a69dd96aeb6992 100644
--- a/sdk/lib/_internal/pub/test/run/runs_app_in_entrypoint_test.dart
+++ b/sdk/lib/_internal/pub/test/run/runs_app_in_entrypoint_test.dart
@@ -25,7 +25,7 @@ main() {
       ])
     ]).create();
 
-    var pub = pubRun(args: ["script"]);
+    var pub = pubRun(args: ["bin/script"]);
     pub.stdout.expect("stdout output");
     pub.stderr.expect("stderr output");
     pub.shouldExit(123);