chore: rename non existant globals [skip ci]

Author: posva

package.json

@@ -3,8 +3,8 @@
   "version": "3.0.0-alpha.4",
   "description": "Official Firebase bindings for Vue.js",
   "packageManager": "[email protected]",
-  "unpkg": "dist/vuefire.global-vue-2.js",
-  "jsdelivr": "dist/vuefire.global-vue-2.js",
+  "unpkg": "dist/index.iife.js",
+  "jsdelivr": "dist/index.iife.js",
   "type": "module",
   "exports": {
     ".": {