Restrict bulk buy max to coupon target ticket only

[dd32]

Summary

• The tix_bypass_max_tickets_per_order coupon option was globally increasing the max tickets per order for ALL ticket types, not just the tickets the coupon targets
• Now the increased max is only applied to tickets where the coupon is actually applied (tix_coupon_applied === true)
• This follows up on PR Allow bypassing max ticket limit when using coupon code WordPress/wordcamp.org#990 which introduced the bulk buy feature

Changes

Three locations in camptix.php were fixed:

1. Ticket selection form initialization (~line 5360): Removed the global $max_tickets_per_order bump when coupon is loaded
2. Ticket selection form rendering (~line 5746): Changed to use a local $ticket_max variable instead of mutating the shared $max_tickets_per_order
3. Order verification (~line 7664): Added per-ticket check using $item_max that only bumps the max for coupon-applied tickets

Test plan

• Existing CampTix tests pass (63 tests, 80 assertions)
• Create a coupon that applies to Ticket A only, with bulk buy enabled
• Verify Ticket A shows the increased quantity dropdown (3x)
• Verify Ticket B (not targeted by coupon) still shows the normal max quantity
• Verify order validation enforces the correct limits per ticket type

Fixes WordPress#1305

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