update afterware arg parsing

[comhar]

Related Issue
#776

Proposed Changes
This pr updates how args are passed to afterware in _endp. These args are generated using _wrap_req which was recently updated in this commit.

On main we currently pass the args to afterware like this

_,*wreq = await _wrap_req(req, _params(a))
nr = a(resp, *wreq)

In this pr we tweak the passing of these args which resolves the issue with toasts.

wreq = await _wrap_req(req, _params(a))
nr = a(*wreq.values())

Types of changes
What types of changes does your code introduce? Put an x in all the boxes that apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist
Go over all the following points, and put an x in all the boxes that apply:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• I am aware that this is an nbdev project, and I have edited, cleaned, and synced the source notebooks instead of editing .py or .md files directly.

Additional Information

fh_toasts_bug.mp4

[gitnotebooks]

Found 1 changed notebook. Review the changes at https://app.gitnotebooks.com/AnswerDotAI/fasthtml/pull/777

[comhar]

This test fails on main but passes on the pr branch.