After removeWidget(el) the resize button disappeared

[bruce-teng]

Subject of the issue

the office demo，after clicking the X in the upper right corner, the resize button in the lower right disappeared
https://gridstackjs.com/demo/serialization.html

Your environment

• version of gridstack.js 6.0.1
• browser: Chrome/105.0.0.0
• OS: Windows 10 21H2

Steps to reproduce

https://gridstackjs.com/demo/serialization.html

Expected behavior

after removeWidget the resize button should still show may be

Actual behavior

after clicking the X in the upper right corner, the resize button in the lower right disappeared

[adumesny]

dup of #2034 fixed in upcoming 6.0.2