Auto merge of #29123 - michaelgrigoryan25:master, r=jdm

Replaced explicit Default implementation for Seed with derive.

<!-- Please describe your changes on the following line: -->
This patch replaces the explicit `std::default::Default` implementation of the [Seed](https://github.com/servo/servo/blob/master/components/rand/lib.rs) struct with a derive macro.

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors

<!-- Either: -->
- [x] These changes do not require tests.

<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

components/rand/lib.rs

@@ -63,14 +63,9 @@ impl RngCore for ServoRng {
     }
 }
 
+#[derive(Default)]
 pub struct Seed([u8; 32]);
 
-impl Default for Seed {
-    fn default() -> Self {
-        Seed([0; 32])
-    }
-}
-
 impl AsMut<[u8]> for Seed {
     fn as_mut(&mut self) -> &mut [u8] {
         &mut self.0