Fix oppia#20531 Change ID for "The answers in this group are correct"…

… label (oppia#20884)

* Rename input id in modal for adding answers to be unique

* rename input ID to be a noun

core/templates/pages/exploration-editor-page/editor-tab/templates/modal-templates/add-answer-group-modal.component.html

@@ -59,11 +59,11 @@ <h3 tabindex="0" #addResponse>Add Response</h3>
   </form>
 
   <div class="oppia-correctness-label-editor" *ngIf="!isCurrentInteractionLinear()">
-    <input id="labelledAsCorrect"
+    <input id="labelledAsCorrectForAnswerGroupModal"
            class="e2e-test-editor-correctness-toggle mr-2"
            type="checkbox"
            [(ngModel)]="tmpOutcome.labelledAsCorrect">
-    <strong><label for="labelledAsCorrect">The answers in this group are correct</label></strong>
+    <strong><label for="labelledAsCorrectForAnswerGroupModal">The answers in this group are correct</label></strong>
   </div>
 
   <oppia-question-misconception-editor *ngIf="questionModeEnabled || tagMisconceptionsFeatureFlagIsEnabled"