Added a handler to the score form to prevent the default browser behaviour

frontend/src/components/submission_notes/toolbars/AnnotatedSubmissionBottomToolbar.vue

@@ -5,6 +5,7 @@
         ref="scoreForm"
         v-model="scoreIsValid"
         lazy-validation
+        @submit.prevent="submit"
       >
         <v-text-field
           id="score-input"