feat: use scoped package @deckdeckgo/qrcode

Author: peterpeterparker

studio/package-lock.json

@@ -18,8 +18,8 @@
     "@deckdeckgo/highlight-code": "^1.0.0-alpha.15",
     "@deckdeckgo/inline-editor": "^1.0.0-alpha.7",
     "@deckdeckgo/lazy-img": "^1.0.0-alpha.3",
+    "@deckdeckgo/qrcode": "^1.0.0-alpha.7",
     "@ionic/core": "4.1.1",
-    "deckdeckgo-qrcode": "^1.0.0-alpha.6",
     "deckdeckgo-remote": "^1.0.0-alpha.8",
     "firebase": "^5.9.0",
     "idb-keyval": "^3.1.0",