changed calculator result display time to 5 secs

[nazgul-beta]

Type of change

• [ ] Added new project
• [ ] Bug fix
• [ ] New features
• [ ] Enhanced documentation

Changes proposed in this pull request

• Project name :

• Short description :

Checklist

• [ ] The code is Python 3 compatible
• [ ] I have added relevant comments in my file to make code understandable
• [ ] I have added my project in a folder which includes all the necessary files

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[nazgul-beta]

Increased sleep time in calculator project at the time of showing the result