fix: the conflict_with in no-session arg (#2531)

crates/goose/src/config/base.rs

@@ -346,6 +346,7 @@ impl Config {
         let mut file = OpenOptions::new()
             .write(true)
             .create(true)
+            .truncate(false)
             .open(&self.config_path)?;
 
         // Acquire an exclusive lock for the entire operation

crates/goose/src/providers/google.rs

@@ -184,7 +184,7 @@ impl Provider for GoogleProvider {
         let mut models: Vec<String> = arr
             .iter()
             .filter_map(|m| m.get("name").and_then(|v| v.as_str()))
-            .map(|name| name.split('/').last().unwrap_or(name).to_string())
+            .map(|name| name.split('/').next_back().unwrap_or(name).to_string())
             .collect();
         models.sort();
         Ok(Some(models))