Remove preprocessing for String.format

This should now be in the model, and the implementation of models can
use CProverString.format.

Author: romainbrenguier

jbmc/src/java_bytecode/java_string_library_preprocess.cpp

@@ -1848,16 +1848,6 @@ void java_string_library_preprocesst::initialize_conversion_table()
   cprover_equivalent_to_java_function
     ["java::java.lang.String.equalsIgnoreCase:(Ljava/lang/String;)Z"]=
       ID_cprover_string_equals_ignore_case_func;
-  conversion_table
-    ["java::java.lang.String.format:(Ljava/lang/String;[Ljava/lang/Object;)"
-     "Ljava/lang/String;"] =
-      std::bind(
-        &java_string_library_preprocesst::make_string_format_code,
-        this,
-        std::placeholders::_1,
-        std::placeholders::_2,
-        std::placeholders::_3,
-        std::placeholders::_4);
 
   std::string format_signature = "java::org.cprover.CProverString.format:(";
   for(std::size_t i = 0; i < MAX_FORMAT_ARGS + 1; ++i)