Fix sort mismtach in CVC4

This fixes the sort mismatch that can occur when CVC4 expects an
Array of Bool but cbmc translation produces an Array of (_ BitVec 1).

Partial fix for diffblue#5970 and diffblue#5977

Author: TGWDB

src/solvers/smt2/smt2_conv.cpp

@@ -96,6 +96,7 @@ smt2_convt::smt2_convt(
     break;
 
   case solvert::CVC4:
+    use_array_of_bool = true;
     use_as_const = true;
     break;