Fix Pressing Enter in Alpha Greeter: Correct on_press Function Definitions

[snorreks]

Summary

This PR fixes an issue with the on_press function definitions in the alpha-nvim configuration, which caused an error when pressing Enter in the options of the alpha greeter. The previous implementation resulted in an E5108 error due to on_press values being interpreted as strings instead of functions.

Changes

• Updated the on_press values to be properly defined as Lua functions using the __raw attribute.
• Ensured that each on_press value is correctly formatted as a Lua function.

Issue

Fixes the E5108 error: "attempt to call a string value" in alpha-nvim, which occurred when pressing Enter in the options of the alpha greeter on Neovim startup.

Testing

• Verified that the on_press functions are now correctly executed without errors.
• Tested the functionality of each button in the alpha greeter to ensure they perform the intended actions.

Additional Notes

This change ensures that the alpha-nvim configuration is more robust and prevents similar issues in the future, providing a smooth experience when interacting with the alpha greeter options.

[redyf]

Thank you very much for your contribution!