Fixed find_max_global() overload that was ignoring one of its arguments.

dlib/global_optimization/find_max_global.h

@@ -217,7 +217,7 @@ template <typename T> static auto go(T&& f, const matrix<double, 0, 1>& a) -> de
         double solver_epsilon 
     )
     {
-        return find_max_global(std::move(f), bound1, bound2, std::vector<bool>(bound1.size(),false), num, FOREVER, solver_epsilon);
+        return find_max_global(std::move(f), bound1, bound2, is_integer_variable, num, FOREVER, solver_epsilon);
     }
 
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