Fix: Windows test failure after recent asset library path changes

Test was failing since efdda78175. The asset library path was now using
backslashes on Windows, and got compared to a path with forward slashes. Use
our higher level path comparison function to make sure they point to the same
directory.

source/blender/asset_system/tests/asset_library_service_test.cc

@@ -346,7 +346,9 @@ TEST_F(AssetLibraryServiceTest,
     AssetCatalogService &on_disk_catservice = on_disk_lib->catalog_service();
 
     EXPECT_NE(on_disk_lib, runtime_lib);
-    EXPECT_EQ(on_disk_lib->root_path(), asset_library_root_ + SEP);
+    EXPECT_EQ(BLI_path_cmp_normalized(on_disk_lib->root_path().c_str(),
+                                      (asset_library_root_ + SEP).c_str()),
+              0);
 
     /* Check if catalog was moved correctly. */
     {