fix: 型引数名の重複に関するエラーが適切に発生しない問題を修正#1003

takejohn merged 2 commits intoaiscript-dev:bugfix/1.2.1aiscript-dev/aiscript:bugfix/1.2.1from

takejohn:fix/997_998_duplicate-type-parameter-name-errortakejohn/aiscript:fix/997_998_duplicate-type-parameter-name-errorCopy head branch name to clipboard