Fix Save Editor inventory edits leaving C/D-pad buttons desynced (#7008)

The Save Editor's Inventory tab writes gSaveContext.inventory.items[]
directly, but a C/D-pad item button mirrors the slot it points at
(buttonItems[i] == items[cButtonSlots[i-1]]). That derived value was
never refreshed, so e.g. emptying a bottle assigned to a button left the
button showing its old contents -- a desync the game's equip/inventory
consistency then trips on at the next age swap or bottle update.

Re-sync any button pointing at an edited slot after the write. Equipment
assigned to a button stores an equipment-page index in cButtonSlots
(>= inventory size), so it never matches an inventory slot and is left
untouched.
Includes a default-on "Keep C/D-pad buttons in sync" checkbox
(mirroring "Restrict to valid items") so inventory edits can intentionally
leave a slot desynced from its button for RBA practice/debugging.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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