Reverted lastOpenedImage back to false

Author: Gabriel Galvao da Gama

app/code/Magento/Ui/view/base/web/js/grid/columns/image-preview.js

@@ -167,7 +167,7 @@ define([
          * Close image preview
          */
         hide: function () {
-            this.lastOpenedImage(null);
+            this.lastOpenedImage(false);
             this.visibleRecord(null);
             this.height(0);
             this._selectRow(null);

dev/tests/js/jasmine/tests/app/code/Magento/Ui/base/js/grid/columns/image-preview.test.js

@@ -62,7 +62,7 @@ define([
                 expect(imagePreview.lastOpenedImage()).toBe(record._rowIndex);
 
                 imagePreview.hide();
-                expect(imagePreview.lastOpenedImage()).toBe(null);
+                expect(imagePreview.lastOpenedImage()).toBe(false);
             });
 
         });