test(import): fix stale QGIS nested group name expectation

#1593 changed QGIS layer-group names from flattened ("Transport /
Places") to plain names plus a parentId. #1584 branched before that
change and added a visibility-inheritance test still asserting the
flattened name, so main went red once both landed.

The importer behavior is correct; only the expectation was stale.

Author: giswqs

tests/qgis-project-import.test.ts

@@ -292,7 +292,7 @@ describe("QGIS project import", () => {
       result.project.layerGroups?.map((group) => [group.name, group.visible]),
       [
         ["Transport", false],
-        ["Transport / Places", false],
+        ["Places", false],
       ],
     );
     const rendered = applyGroupEffects(result.project.layers, result.project.layerGroups ?? []);