fix(aurabuff): hide the pet reminder while mounted

[Trenchfoote]

Mounting in the open world auto-dismisses the pet, so the "pet not summoned" reminder appeared for the whole ride and cleared itself on dismount when the pet returned. Skyriding already hid it, because the reminder pass suppresses everything while mounted and flying, which made the warning look inconsistent as well as wrong.

A pet cannot be summoned while mounted in any case, so the reminder is never actionable there. This matches the Pet on Passive reminder in the same block, which already skips while mounted for the same reason.

PLAYER_MOUNT_DISPLAY_CHANGED is already registered, so mounting and dismounting re-evaluate the reminder with no new events.

What does this PR do?

How was it tested?

Screenshots

Checklist

• New settings default OFF (no behavior change without opt-in)
• Zero cost while disabled: no events registered, no polling, no hooks doing work, no frames built
• Cheap while enabled: event-driven (no polling, no timer-based logic, no per-frame allocations)
• No writes onto Blizzard-owned frames (weak-table pattern used); HookScript/hooksecurefunc only, never SetScript on Blizzard frames
• Tested in-game, works on live retail; no load errors on the 12.1 PTR client

[Copilot]

Pull request overview

This PR fixes an AuraBuffReminders UX issue where the “pet not summoned” reminder could appear while the player is mounted in the open world (a state where summoning a pet is not actionable), aligning its behavior with the existing “Pet on Passive” reminder logic.

Changes:

• Suppresses the “pet not summoned” reminder when IsMounted() is true.
• Keeps reminder refresh event-driven using the already-registered PLAYER_MOUNT_DISPLAY_CHANGED (no new events needed).

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