Remove workaround for bazelbuild/bazel#15916.

The fix is included in all versions of Bazel starting with 6.0.

Author: phst

MODULE.bazel.lock

@@ -103,9 +103,6 @@ def _elisp_http_archive_impl(repository_ctx):
         stripPrefix = repository_ctx.attr.strip_prefix,
     )
     defs_bzl = str(repository_ctx.attr._defs_bzl)
-    if not defs_bzl.startswith("@"):
-        # Work around https://github.com/bazelbuild/bazel/issues/15916.
-        defs_bzl = "@" + defs_bzl
     repository_ctx.template(
         "BUILD.bazel",
         Label("//elisp:BUILD.template"),