Add 'default' alias

This makes it appear in the tree as a named node.

src/grammar.json

@@ -682,7 +682,12 @@
           "type": "FIELD",
           "name": "pattern",
           "content": {
-            "type": "STRING",
+            "type": "ALIAS",
+            "content": {
+              "type": "STRING",
+              "value": "default"
+            },
+            "named": true,
             "value": "default"
           }
         },

src/node-types.json

@@ -187,7 +187,7 @@
         "types": [
           {
             "type": "default",
-            "named": false
+            "named": true
           }
         ]
       },
@@ -658,7 +658,7 @@
   },
   {
     "type": "default",
-    "named": false
+    "named": true
   },
   {
     "type": "escape_sequence",

src/parser.c

@@ -338,7 +338,7 @@ static const TSSymbolMetadata ts_symbol_metadata[] = {
   },
   [anon_sym_default] = {
     .visible = true,
-    .named = false,
+    .named = true,
   },
   [anon_sym_unset] = {
     .visible = true,