ssh-remoting: Tidy up the code a bit after #18094 (#18102)

Release Notes:

- N/A

crates/client/src/client.rs

@@ -1622,7 +1622,7 @@ impl ProtoClient for Client {
         &self.handler_set
     }
 
-    fn goes_via_collab(&self) -> bool {
+    fn is_via_collab(&self) -> bool {
         true
     }
 }