bedrock: Fix duplicate region input (#41341)

Closes #41313

Release Notes:

- Fixes #41313

<img width="453" height="870" alt="Screenshot 2025-10-27 at 10 23 37 PM"
src="https://github.com/user-attachments/assets/93bfba18-1bff-494e-a4c2-05b54ad6eed8"
/>

Co-authored-by: Richard Feldman <oss@rtfeldman.com>

crates/language_models/src/provider/bedrock.rs

@@ -1221,7 +1221,6 @@ impl Render for ConfigurationView {
                     )
             )
             .child(self.render_static_credentials_ui())
-            .child(self.region_editor.clone())
             .child(
                 Label::new(
                     format!("You can also assign the {ZED_BEDROCK_ACCESS_KEY_ID_VAR}, {ZED_BEDROCK_SECRET_ACCESS_KEY_VAR} AND {ZED_BEDROCK_REGION_VAR} environment variables and restart Zed."),