Fix bzlmod build

The implementation of the bzlmod build missed a build
failure due to the incorrect dir_name set on the gerrit_plugin.

Also fix the Implementation-URL in the package manifest file.

Change-Id: I0bab6c936fc9f6fe31cb1605853b0e8c96c2c331

BUILD

diff --git a/BUILD b/BUILD
index 944083b..dca063f 100644
--- a/BUILD
+++ b/BUILD
@@ -10,10 +10,9 @@
     srcs = glob([
         "src/main/java/**/*.java",
     ]),
-    dir_name = "owners",
     manifest_entries = [
         "Implementation-Title: Gerrit OWNERS autoassign plugin",
-        "Implementation-URL: https://gerrit.googlesource.com/plugins/owners",
+        "Implementation-URL: https://gerrit.googlesource.com/plugins/owners-autoassign",
         "Gerrit-PluginName: owners-autoassign",
         "Gerrit-Module: com.googlesource.gerrit.owners.common.AutoassignModule",
     ],