Scalafmt toolchain improvements

Author: jjudd

rules/scalafmt/private/test.bzl

@@ -32,7 +32,7 @@ scala_non_default_format_attributes = {
 def build_format(ctx):
     files = []
     manifest_content = []
-    config = ctx.toolchains["//rules/scalafmt:toolchain_type"].scalafmt_config.config
+    config = ctx.toolchains["@rules_scala_annex//rules/scalafmt:toolchain_type"].scalafmt_config.config
 
     for src in ctx.files.srcs:
         if src.short_path.endswith(".scala") and src.is_source:

rules/scalafmt/register_toolchain.bzl

@@ -15,7 +15,7 @@ _scalafmt_config = rule(
     attrs = {
         "config": attr.label(
             allow_single_file = [".conf"],
-            default = "//:.scalafmt.conf",
+            default = "@rules_scala_annex//:.scalafmt.conf",
             doc = "The Scalafmt configuration file.",
         ),
     },