Differentiate method/tymethod by determining 'defaultness'

Currently a method only has defaultness if it is a provided trait
method, but this will change when specialisation is available and may
need to become a concept known to hir.

I opted to go for a 'fewest changes' approach given specialisation is
still under development.

editors/code/src/commands.ts

@@ -425,7 +425,7 @@ export function openDocs(ctx: Ctx): Cmd {
         const client = ctx.client;
         const editor = vscode.window.activeTextEditor;
         if (!editor || !client) {
-            return
+            return;
         };
 
         const position = editor.selection.active;