Remove QueryId from the exported themes

[madhusudhand]

Exported theme includes QueryId attribute in the template. It should be removed to avoid content issues when theme installed on other sites.

<!-- wp:query {"queryId":14,"query":{"perPage":"6","pages":0,"offset":0,"postType":"post","order":"desc","orderBy":"date","author":"","search":"","exclude":[],"sticky":"exclude","inherit":false},"displayLayout":{"type":"flex","columns":3},"layout":{"type":"constrained","wideSize":"1400px"}} -->

[mikachan]

I believe that queryIds should be preserved, based on this discussion here: WordPress/wordpress-develop#3899 (comment)