Fix incorrect condition in TransformationFaultHandler

We were incorrectly checking if an iterator was
uninitialized_class_definitions_.end() instead of
initialized_class_definitions_.end(). This caused several tests to
fail when run with redefine-stress because they would cause the
faulting code to resume incorrectly.

Test: ./test.py --host -j50
Test: ./test.py --host --redefine-stress -j50

Bug: 73177368

Change-Id: I9ca86aa4e30f342d73545d1a417bab8a0e817251