Fix test failure. Expected error message was wrong. It should be "Failed to read image data".

Author: kevinbackhouse

tests/bugfixes/github/test_issue_ghsa_496f_x7cq_cq39.py

@@ -15,6 +15,6 @@ class EpsImageDeleteSegV(metaclass=CaseMeta):
     stdout = [""]
     stderr = [
         """$exception_in_erase """ + filename + """:
-$kerCorruptedMetadata
+$kerFailedToReadImageData
 """]
     retval = [1]