Typo in examples/calculator/CMakeLists.txt

[yresk]

Description with steps to reproduce

CALC_HEAEDR_FILES used instead of
CALC_HEADER_FILES -> calculator header not shown in QtCreator

Supporting files, videos and screenshots

not necessary

Qt Version

any

Operating system

any

Additional context

No response

Checklist

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• I have attached all requested files and information to this report
• I have attempted to identify the root problem as concisely as possible, and have used minimal reproducible examples where possible