Revert "bpo-35239: _PySys_EndInit() copies module_search_path (GH-10532)" (GH-10660)

This reverts commit d2be9a5c13221fb84c2221bbfd93efac6111e697.
diff --git a/Lib/test/test_embed.py b/Lib/test/test_embed.py
index 89797d2..11f37f0 100644
--- a/Lib/test/test_embed.py
+++ b/Lib/test/test_embed.py
@@ -301,6 +301,10 @@
     }
 
     # main config
+    UNTESTED_MAIN_CONFIG = (
+        # FIXME: untested main configuration variables
+        'module_search_path',
+    )
     COPY_MAIN_CONFIG = (
         # Copy core config to main config for expected values
         'argv',
@@ -311,8 +315,7 @@
         'install_signal_handlers',
         'prefix',
         'warnoptions',
-        # xoptions is created from core_config in check_main_config().
-        # 'module_search_paths' is copied to 'module_search_path'.
+        # xoptions is created from core_config in check_main_config()
     )
 
     # global config
@@ -386,10 +389,12 @@
         main_config = config['main_config']
 
         # main config
+        for key in self.UNTESTED_MAIN_CONFIG:
+            del main_config[key]
+
         expected_main = {}
         for key in self.COPY_MAIN_CONFIG:
             expected_main[key] = core_config[key]
-        expected_main['module_search_path'] = core_config['module_search_paths']
         expected_main['xoptions'] = self.main_xoptions(core_config['xoptions'])
         self.assertEqual(main_config, expected_main)