Remove unnecessary use of dynamic_object

[tautschnig]

dynamic_object() was used as left-hand side of an implication despite the
right-hand side being independent of that condition. This avoids generating
duplicate assertions, as witnessed by the changes to regression tests.

• 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).
• 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

Merging #6083 (dfe2d55) into develop (3547708) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #6083      +/-   ##
===========================================
- Coverage    74.40%   74.37%   -0.03%     
===========================================
  Files         1446     1446              
  Lines       157816   157813       -3     
===========================================
- Hits        117427   117379      -48     
- Misses       40389    40434      +45     

Impacted Files	Coverage Δ
src/analyses/goto_check.cpp	88.00% <100.00%> (-0.04%)	⬇️
src/ansi-c/parser_static.inc	80.34% <0.00%> (-13.68%)	⬇️
src/util/config.h	50.00% <0.00%> (-12.50%)	⬇️
src/ansi-c/parser.y	53.87% <0.00%> (-7.06%)	⬇️
src/util/simplify_expr_floatbv.cpp	86.82% <0.00%> (-6.98%)	⬇️
src/ansi-c/literals/unescape_string.cpp	89.15% <0.00%> (-3.62%)	⬇️
src/ansi-c/c_typecheck_base.cpp	50.68% <0.00%> (-3.31%)	⬇️
src/util/simplify_expr_pointer.cpp	85.34% <0.00%> (-2.59%)	⬇️
src/util/floatbv_expr.h	68.86% <0.00%> (-1.89%)	⬇️
src/util/c_types.h	92.79% <0.00%> (-1.81%)	⬇️
... and 16 more

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[martin-cs]

Yikes!