Update chapter 9-ids to be agnostic to the c-library error line numbers of dukpy

Proposed fix for https://edstem.org/us/courses/56883/discussion/4981313 Test still work as expected locally with these changes

tests/chapter9-exercise-ids-tests.md

@@ -87,8 +87,7 @@ Replace the id with something that has a different id.
     Traceback (most recent call last):
       ...
     _dukpy.JSRuntimeError: ReferenceError: identifier 'one' undefined
-        at [anon] (duk_js_var.c:1239) internal
-        at eval (eval:1) preventsyield
+      ...
     >>> js.run("replacement;")
     {'handle': 2}
     >>> browser.print_tree(this_browser.active_tab.document)
@@ -110,20 +109,17 @@ Empty the document of ids.
     Traceback (most recent call last):
       ...
     _dukpy.JSRuntimeError: ReferenceError: identifier 'alice' undefined
-        at [anon] (duk_js_var.c:1239) internal
-        at eval (eval:1) preventsyield
+      ...
     >>> js.run("one;")
     Traceback (most recent call last):
       ...
     _dukpy.JSRuntimeError: ReferenceError: identifier 'one' undefined
-        at [anon] (duk_js_var.c:1239) internal
-        at eval (eval:1) preventsyield
+      ...
     >>> js.run("replacement;")
     Traceback (most recent call last):
       ...
     _dukpy.JSRuntimeError: ReferenceError: identifier 'replacement' undefined
-        at [anon] (duk_js_var.c:1239) internal
-        at eval (eval:1) preventsyield
+      ...
     >>> browser.print_tree(this_browser.active_tab.document)
      DocumentLayout()
        BlockLayout(x=13, y=18, width=774, height=15.0)