fix indent in python test

Author: kastiglione

lldb/test/API/lang/objc/print-obj/TestPrintObj.py

@@ -70,7 +70,7 @@ def test_print_obj(self):
         # issue our 'po lock_me' command.
 
         for frame in other_thread.frames:
-           if frame.name == "main":
+            if frame.name == "main":
                 other_thread.selected_frame = frame
                 if self.TraceOn():
                     print("selected frame:" + lldbutil.get_description(frame))