Notify plugin watcher after deployment changes

Restore the onDidDeploy() dorwarding lost in the refactoring for
headless plugins.

Signed-off-by: Christian W. Damus <cdamus.ext@eclipsesource.com>

packages/plugin-ext/src/hosted/browser/hosted-plugin.ts

@@ -240,6 +240,7 @@ export class HostedPluginSupport extends AbstractHostedPluginSupport<PluginManag
     }
 
     protected override afterStart(): void {
+        this.watcher.onDidDeploy(() => this.load());
         this.server.onDidOpenConnection(() => this.load());
     }