Non-script source file src/result.rs should not be executable

[musicinmybrain]

Describe the bug

The source file src/result.rs has the executable bit set in its filesystem permissions, but it is not a script.

To Reproduce
Steps to reproduce the behavior:

1. Examine https://github.com/zip-rs/zip2/blob/v1.3.0/src/result.rs.
2. Observe that the GitHub UI describes it as an “Executable File,” but that it is a Rust source rather than an interpreted script.

Expected behavior
Non-script sources should not have executable permissions.

Screenshots
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Desktop (please complete the following information):
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Smartphone (please complete the following information):
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Additional context
In particular, executable Rust sources can cause problems with Linux distribution packaging because #![…] directives look like shebang lines, and this can confuse automation.

[Pr0methean]

Fixed.

[musicinmybrain]

Thanks!