Revert "Use a patch to remove the register_toolchains call from the MODULE"

This reverts commit 3d8a4ddcfc9a98c24dab2d22693a66d26a015385.

It breaks BCR publishing (best guess: the template doesn't allow
a patches value).
diff --git a/.bcr/source.template.json b/.bcr/source.template.json
index 2dcb5f1..54d1e7b 100644
--- a/.bcr/source.template.json
+++ b/.bcr/source.template.json
@@ -1,8 +1,5 @@
 {
   "integrity": "",
   "strip_prefix": "{REPO}-{VERSION}",
-  "url": "https://github.com/{OWNER}/{REPO}/releases/download/{TAG}/rules_testing-{TAG}.tar.gz",
-  "patches": {
-    "remove_register_toolchains.patch": "sha256-TSdJKlMRNjqVEpPFjV3CItj8EKi5Zm6qabiIPVYtvnc="
-  }
+  "url": "https://github.com/{OWNER}/{REPO}/releases/download/{TAG}/rules_testing-{TAG}.tar.gz"
 }
diff --git a/remove_register_toolchains.patch b/remove_register_toolchains.patch
deleted file mode 100644
index fa9676f..0000000
--- a/remove_register_toolchains.patch
+++ /dev/null
@@ -1,18 +0,0 @@
-diff --git a/MODULE.bazel b/MODULE.bazel
-index 046e33e..fc0dde5 100644
---- a/MODULE.bazel
-+++ b/MODULE.bazel
-@@ -31,9 +31,10 @@ python.toolchain(
- )
- use_repo(python, "python3_11_toolchains")
- 
--register_toolchains(
--    "@python3_11_toolchains//:all",
--)
-+# Dev only. Commented out by BCR publishing patch
-+# register_toolchains(
-+#     "@python3_11_toolchains//:all",
-+# )
- 
- pip = use_extension(
-     "@rules_python//python:extensions.bzl",