fix: remove settings.DEBUG from problem block (#37812)

* fix: remove settings.DEBUG from problem block

xmodule/capa_block.py

@@ -535,7 +535,7 @@ class _BuiltInProblemBlock(
         the error in Studio. At the same time, in production, we don't want
         to show errors to students.
         """
-        return getattr(self.runtime, "is_author_mode", False) or settings.DEBUG
+        return getattr(self.runtime, "is_author_mode", False)
 
     @classmethod
     def filter_templates(cls, template, course):

xmodule/tests/test_capa_block.py

@@ -1408,6 +1408,7 @@ class ProblemBlockTest(unittest.TestCase):  # lint-amnesty, pylint: disable=miss
         """
         # Create the block
         block = CapaFactory.create(attempts=1, user_is_staff=False)
+        block.runtime.is_author_mode = True
 
         # Simulate answering a problem that raises the exception
         with patch("xmodule.capa.capa_problem.LoncapaProblem.grade_answers") as mock_grade:
@@ -2516,6 +2517,7 @@ class ProblemBlockTest(unittest.TestCase):  # lint-amnesty, pylint: disable=miss
         """
         render_template.return_value = "<div>Test Template HTML</div>"
         block = CapaFactory.create()
+        block.runtime.is_author_mode = True
 
         # Simulate throwing an exception when the capa problem
         # is asked to render itself as HTML