[lldb] Fix TestSettings.py (#154849)

Fixes a few test failures on windows. See
#153233

Author: kastiglione

lldb/test/API/commands/settings/TestSettings.py

@@ -1051,6 +1051,7 @@ def test_settings_show_defaults(self):
             substrs=["(default: empty)", '[0]: "PATH"'],
         )
         # dictionaries
+        self.runCmd("settings clear target.env-vars")
         self.expect(
             "settings show --defaults target.env-vars",
             matching=False,
@@ -1070,7 +1071,7 @@ def test_settings_show_defaults(self):
         self.runCmd("settings set target.exec-search-paths /tmp")
         self.expect(
             "settings show --defaults target.exec-search-paths",
-            substrs=["(default: empty)", "[0]: /tmp"],
+            patterns=[r"\(default: empty\)", r"\[0\]: [/\\]tmp"],
         )
         # path map
         self.expect(
@@ -1081,7 +1082,7 @@ def test_settings_show_defaults(self):
         self.runCmd("settings set target.source-map /abc /tmp")
         self.expect(
             "settings show --defaults target.source-map",
-            substrs=["(default: empty)", '[0] "/abc" -> "/tmp"'],
+            patterns=[r"\(default: empty\)", r'\[0\] "[/\\]abc" -> "[/\\]tmp"'],
         )
 
     def get_setting_json(self, setting_path=None):