Refactor test assertions and improve code formatting

- Simplified test assertions in `fs_snapshot.rs` and `ref_properties.rs` for better readability by removing unnecessary line breaks.
- Enhanced the formatting of code in `rojo_ref.rs` to maintain consistency and improve clarity.

These changes improve the overall readability and maintainability of the test code and related implementations.

src/syncback/fs_snapshot.rs

@@ -744,9 +744,7 @@ mod tests {
             "Attachment1 wrong. Got:\n{result}"
         );
         assert!(
-            result.contains(
-                r#""Rojo_Ref_PrimaryPart": "Workspace/Model/Handle.model.json5""#
-            ),
+            result.contains(r#""Rojo_Ref_PrimaryPart": "Workspace/Model/Handle.model.json5""#),
             "PrimaryPart wrong. Got:\n{result}"
         );
     }