CHC: enable a KNOWNBUG test

[kroening]

c7835345cf635279cf59f4a has fixed a further KNOWNBUG test.

• Each commit message has a non-empty body, explaining why the change was made.
• n/a Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• n/a The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• n/a My commit message includes data points confirming performance improvements (if claimed).
• n/a My PR is restricted to a single feature or bugfix.
• n/a White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[codecov]

Codecov Report

Base: 78.01% // Head: 78.01% // No change to project coverage 👍

Coverage data is based on head (ddf0fd2) compared to base (e0e8d65).
Patch coverage: 84.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #7269   +/-   ##
========================================
  Coverage    78.01%   78.01%           
========================================
  Files         1625     1625           
  Lines       187407   187407           
========================================
  Hits        146201   146201           
  Misses       41206    41206           

Impacted Files	Coverage Δ
src/cprover/inductiveness.cpp	78.35% <68.75%> (ø)
src/cprover/solver.cpp	92.00% <80.95%> (ø)
src/cprover/generalization.cpp	84.21% <84.21%> (ø)
src/cprover/solver_types.cpp	76.92% <86.66%> (ø)
src/cprover/inductiveness.h	100.00% <100.00%> (ø)
src/cprover/propagate.cpp	74.28% <100.00%> (ø)
src/cprover/solver_types.h	93.10% <100.00%> (ø)
... and 3 more

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