Clear the "thread-format" setting after mucking with it.

llvm-svn: 239863

lldb/test/settings/TestSettings.py

@@ -366,6 +366,7 @@ class SettingsCommandTestCase(TestBase):
         # Make sure when no quotes are provided that we maintain any trailing spaces
         self.runCmd ('settings set thread-format abc def   ')
         self.expect ("settings show thread-format", 'thread-format (format-string) = "abc def   "')
+        self.runCmd ('settings clear thread-format')
 
     def test_settings_with_trailing_whitespace (self):