fix signature prefill

app/javascript/submission_form/initials_step.vue

@@ -203,7 +203,7 @@ export default {
   emits: ['attached', 'update:model-value', 'start', 'minimize', 'focus'],
   data () {
     return {
-      isInitialsStarted: !!this.previousValue,
+      isInitialsStarted: false,
       isUsePreviousValue: true,
       isDrawInitials: false,
       uploadImageInputKey: Math.random().toString()
@@ -218,6 +218,9 @@ export default {
       }
     }
   },
+  created () {
+    this.isInitialsStarted = !!this.computedPreviousValue
+  },
   async mounted () {
     this.$nextTick(() => {
       if (this.$refs.canvas) {