fix: "OffscreenCanvas is not defined"

Doing a `object instanceof OffscreenCanvas` check itself requires
OffscreenCanvas support. Since Firefox/Safari don't support it, this
causes a reference error. Fixed in new barcode-detector version.

Issue: #248

Author: gruhn

package-lock.json

@@ -28,7 +28,7 @@
     "lint": "vue-cli-service lint"
   },
   "dependencies": {
-    "barcode-detector": "^0.5.0",
+    "barcode-detector": "^0.7.0",
     "callforth": "^0.3.1",
     "core-js": "^3.6.5",
     "vue": "^2.6.11",