Auto merge of #13138 - jsnajdr:master, r=nox

Console message packets should have a '_type' attribute

<!-- Please describe your changes on the following line: -->
Renamed the `type_` attribute of `PageError` and `ConsoleAPI` structs to make them correct Firefox RDP packets.

---
<!-- 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
- [x] These changes fix #13137 (github issue number if applicable).

<!-- Either: -->
- [ ] There are tests for these changes OR
- [x] These changes do not require tests because devtools component doesn't have any

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components/devtools_traits/lib.rs

@@ -252,7 +252,7 @@ bitflags! {
 
 #[derive(Deserialize, Serialize)]
 pub struct PageError {
-    #[serde(rename = "type")]
+    #[serde(rename = "_type")]
     pub type_: String,
     pub errorMessage: String,
     pub sourceName: String,
@@ -270,7 +270,7 @@ pub struct PageError {
 
 #[derive(Deserialize, Serialize)]
 pub struct ConsoleAPI {
-    #[serde(rename = "type")]
+    #[serde(rename = "_type")]
     pub type_: String,
     pub level: String,
     pub filename: String,