Enable the new graph nodes by default.

It's been tested in various places now, so this is probably mature
enough to be the default.

CHANGELOG.md

@@ -20,6 +20,9 @@ to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
   branches aren't managed by you. Therefore, untracked branches are no longer
   displayed in `jj log` by default.
 
+* Updated defaults for graph node symbol templates `templates.log_node` and
+  `templates.op_log_node`.
+
 ### Deprecations
 
 ### New features

lib/src/settings.rs

@@ -236,16 +236,16 @@ impl UserSettings {
     pub fn commit_node_template(&self) -> String {
         self.node_template_for_key(
             "templates.log_node",
-            r#"if(self, if(current_working_copy, "@", "◉"), "◌")"#,
-            r#"if(self, if(current_working_copy, "@", "o"), ".")"#,
+            "builtin_log_node",
+            "builtin_log_node_ascii",
         )
     }
 
     pub fn op_node_template(&self) -> String {
         self.node_template_for_key(
             "templates.op_log_node",
-            r#"if(current_operation, "@", "◉")"#,
-            r#"if(current_operation, "@", "o")"#,
+            "builtin_op_log_node",
+            "builtin_op_log_node_ascii",
         )
     }