Solver factory: set_decision_procedure_time_limit does not require dynamic_cast

[tautschnig]

At each call site we already know whether the decision procedure is a solver_resource_limitst, so we just don't invoke it when it is not.

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• 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).
• My PR is restricted to a single feature or bugfix.
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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.03%. Comparing base (d635850) to head (27aa454).

Files	Patch %	Lines
src/goto-checker/solver_factory.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #8409      +/-   ##
===========================================
- Coverage    78.04%   78.03%   -0.01%     
===========================================
  Files         1726     1726              
  Lines       189394   189409      +15     
  Branches     18263    18465     +202     
===========================================
- Hits        147810   147807       -3     
- Misses       41584    41602      +18     

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