Update the package templates

jupyterlab/package.app.json

@@ -129,7 +129,6 @@
       "@jupyterlab/rendermime-extension",
       "@jupyterlab/running-extension",
       "@jupyterlab/services-extension",
-      "@jupyterlab/settingeditor-extension",
       "@jupyterlab/shortcuts-extension",
       "@jupyterlab/tabmanager-extension",
       "@jupyterlab/terminal-extension",
@@ -137,6 +136,7 @@
       "@jupyterlab/tooltip-extension"
     ],
     "singletonPackages": [
+      "@jupyterlab/application",
       "@jupyterlab/apputils",
       "@jupyterlab/console",
       "@jupyterlab/coreutils",

jupyterlab/package.json

@@ -136,6 +136,7 @@
       "@jupyterlab/tooltip-extension"
     ],
     "singletonPackages": [
+      "@jupyterlab/application",
       "@jupyterlab/apputils",
       "@jupyterlab/console",
       "@jupyterlab/coreutils",