Fix well validation issues

[shawnbot]

@nlsfds and I discovered a very strange issue when testing the 6.3.0 release with this form. To reproduce it:

1. Load up the proxy preview of 6.3.0 with the form
2. On the "About you" page, select "Attorney in fact" (or, I believe, any option except "Owner")
3. Fill in the remaining required fields to proceed to the next page

4. On the "Project team" page, click the "Next" button. You should see an odd state in which none of the fields are marked as invalid, but the error list appears below:

   

I don't know why this is happening, but my hunch is that we're rendering improperly nested HTML in one or more of our templates, and changing well components to render <section> elements provides a better "hint" to HTML parsers that the element is closed.

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[github-actions[bot]]

Size Change: -46 B (0%)

Total Size: 91.6 kB

Filename	Size	Change
dist/formio-sfds.css	14 kB	-13 B (0%)
dist/formio-sfds.standalone.js	67.4 kB	-33 B (0%)

ℹ️ View Unchanged

| Filename | Size | Change | | |:--- |:---:|:---:|:---:| | `dist/common.css` | 484 B | 0 B | | | `dist/examples.js` | 3.71 kB | 0 B | | | `dist/examples/example.js` | 683 B | 0 B | | | `dist/portal.js` | 5.39 kB | 0 B | |

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