Revert "Fix media modal crash on WP 7.0 due to attachment filters wrapper change"

[ockham]

Reverts #399.

That PR worked around a WP 7.0 change (core changeset 61757) that wrapped the media attachment filters in a container <div>, which changed the return value of toolbar.get( 'filters' ) from the AttachmentFilters view to a wrapper wp.media.View and crashed customizeFilters().

This has since been fixed upstream: Trac #64948 reverted the shape change in the attachment filters return value and implemented the accessibility improvement via CSS-based positioning instead (changeset 62326 on trunk, merged to the 7.0 branch in 62327). WP 7.0 final therefore ships with the original toolbar.get( 'filters' ) behavior, making the subview-traversal workaround unnecessary complexity.

This revert restores customizeFilters() to its previous implementation, which works on both WP < 7.0 and WP 7.0+.

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This PR was created with assistance from Claude Code (Anthropic).

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