Fix donation amounts not showing on confirmation page

[flintfromthebasement]

Summary

• Donations-only levels have a base initial_payment of 0, so pmpro_isLevelFree() returns true
• The confirmation page template (confirmation.php:140) skips loading the invoice section for "free" levels
• This means pmpro_invoice_bullets_bottom never fires and the donation amount breakdown is never displayed
• Reported via support: https://www.paidmembershipspro.com/forums/topic/donation-amounts-not-showingon-order-page/

Fix

Hooks pmpro_is_level_free in the donations plugin to return false when:

1. The level has donations enabled, AND
2. The current $pmpro_invoice has a non-zero total

Zero-total orders on donation levels are still treated as free (no false positives).

Test plan

• Create a donations-only level (base price $0)
• Complete a checkout with a donation amount (e.g. $50)
• Verify the confirmation page shows the invoice section with "Membership Cost" and "Donation" line items
• Verify the standalone invoice/orders page still shows donation amounts
• Verify a level with donations enabled but a non-zero base price still works correctly
• Verify the confirmation email still includes the donation amount

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