Move @firebase/app-types to regular dependencies

Author: strafe

packages/database/package.json

@@ -30,12 +30,12 @@
     "@firebase/util": "0.3.4",
     "@firebase/component": "0.1.21",
     "@firebase/auth-interop-types": "0.1.5",
+    "@firebase/app-types": "0.6.1",
     "faye-websocket": "0.11.3",
     "tslib": "^1.11.1"
   },
   "devDependencies": {
     "@firebase/app": "0.6.13",
-    "@firebase/app-types": "0.6.1",
     "rollup": "2.33.2",
     "rollup-plugin-typescript2": "0.29.0",
     "typescript": "4.0.5"