Fix state handling and inventory scan logic in weaponRefine plugin

[kw4k]

Motivation

• Correct several correctness and stability issues in the Whitesmith weapon refine plugin that caused incorrect state checks, unintended regex matches, and premature inventory scan termination.

Description

• Fix the weapon-name regex range typo from A-za-z to A-Za-z to prevent unintended character ranges.
• Replace string equality operators (eq/ne) with numeric operators (==/!=) for comparisons against TRUE/FALSE and state constants to make control flow consistent.
• Change findAndSetWeapon to reset weaponInInventory and weaponSetStatus before scanning and to scan the entire inventory instead of aborting on the first non-matching entry.
• Make setRefineAmount accept the argument via my ($arg) and assign it to the global $refineAmount, and replace undef $weaponInInventory with explicit FALSE to keep state consistent.

Testing

• Ran a syntax check with perl -c weaponRefine.pl, which could not complete because OpenKore runtime modules (e.g. Plugins.pm) are not available in the current environment and reported missing modules in @INC (so the check failed here).
• No further automated runtime tests could be executed in this environment due to the lack of OpenKore-specific modules and runtime context.

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Codex Task