ENGCOM-1803: [Forwardport] fix: support multiple minisearch widget instances #15738

 - Merge Pull Request #15738 from vijay-wagento/magento2:2.3-develop-PR-port-15485
 - Merged commits:
   1. a9f5a1d

Author: magento-engcom-team

app/code/Magento/Search/view/frontend/web/form-mini.js

@@ -55,7 +55,7 @@ define([
             this.autoComplete = $(this.options.destinationSelector);
             this.searchForm = $(this.options.formSelector);
             this.submitBtn = this.searchForm.find(this.options.submitBtn)[0];
-            this.searchLabel = $(this.options.searchLabel);
+            this.searchLabel = this.searchForm.find(this.options.searchLabel);
             this.isExpandable = this.options.isExpandable;
 
             _.bindAll(this, '_onKeyDown', '_onPropertyChange', '_onSubmit');