Auto merge of #12243 - TravisDean:else-brace-check, r=ConnorGBrewster

Add style check and test for else braces

<!-- Please describe your changes on the following line: -->
Added a regex check to enforce project style guidelines. Added unit check. Catches:
```
}
else {
```
when it should be
`} else {`

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [ ] `./mach build -d` does not report any errors (no core files changed)
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #12234 (github issue number if applicable).

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- [X] There are tests for these changes OR
- [ ] These changes do not require tests because _____

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1 files changed, 1 insertions, 2 deletions

diff --git a/components/script/webdriver_handlers.rs b/components/script/webdriver_handlers.rs
index fe19f52fafa..16395e53bc0 100644
--- a/components/script/webdriver_handlers.rs
+++ b/components/script/webdriver_handlers.rs
@@ -374,8 +374,7 @@ pub fn handle_is_selected(context: &BrowsingContext,
             }
             else if let Some(_) = node.downcast::<HTMLElement>() {
                 Ok(false) // regular elements are not selectable
-            }
-            else {
+            } else {
                 Err(())
             }
         },