fix: Change default user_input prop value to factory function (#44)

props with object/array as default must have factory functions

Author: razorness

src/components/PasswordStrengthMeter.vue

@@ -256,7 +256,7 @@
        */
       userInputs: {
         type: Array,
-        default: []
+        default: () => []
       }
     },
     data () {