Tidy up the code (#12116)

Small follow-ups for https://github.com/zed-industries/zed/pull/12063
and https://github.com/zed-industries/zed/pull/12103

Release Notes:

- N/A

crates/collab/src/db/queries/dev_servers.rs

@@ -137,7 +137,7 @@ impl Database {
         &self,
         id: DevServerId,
         name: &str,
-        ssh_connection_string: &Option<String>,
+        ssh_connection_string: Option<&str>,
         user_id: UserId,
     ) -> crate::Result<proto::DevServerProjectsUpdate> {
         self.transaction(|tx| async move {
@@ -150,7 +150,9 @@ impl Database {
 
             dev_server::Entity::update(dev_server::ActiveModel {
                 name: ActiveValue::Set(name.trim().to_string()),
-                ssh_connection_string: ActiveValue::Set(ssh_connection_string.clone()),
+                ssh_connection_string: ActiveValue::Set(
+                    ssh_connection_string.map(ToOwned::to_owned),
+                ),
                 ..dev_server.clone().into_active_model()
             })
             .exec(&*tx)

crates/collab/src/rpc.rs

@@ -2442,7 +2442,7 @@ async fn rename_dev_server(
         .rename_dev_server(
             dev_server_id,
             &request.name,
-            &request.ssh_connection_string,
+            request.ssh_connection_string.as_deref(),
             session.user_id(),
         )
         .await?;