reduction warning: bitwise negation of a boolean expression always evaluates to 'true'; did you mean logical negation?

https://github.com/KhronosGroup/SYCL-CTS/blob/9691bc093d4d5b8965be68bfb0716e20fda6205b/tests/reduction/identity_helper.h#L47-L55

Build log:
```
[952/1195] Building CXX object tests/reduction/CMakeFiles/test_reduction_objects.dir/reducer_api_core.cpp.o
In file included from ../tests/reduction/reducer_api_core.cpp:24:
In file included from ../tests/reduction/reducer_api.h:27:
../tests/reduction/identity_helper.h:54:10: warning: bitwise negation of a boolean expression always evaluates to 'true'; did you mean logical negation? [-Wbool-operation]
54 | return ~AccumulatorT{};
| ^~~~~~~~~~~~~~~
| !
../tests/reduction/reducer_api.h:253:29: note: in instantiation of function template specialization 'get_identity, true>' requested here
253 | AccumulatorT expected = get_identity();
| ^
../tests/reduction/../common/type_coverage.h:404:5: note: in instantiation of member function 'check_reducer_identity_operator, bool>::operator()' requested here
404 | ((action{}(std::forward(args)...,
| ^
../tests/reduction/reducer_api.h:271:5: note: in instantiation of function template specialization 'for_all_types, std::multiplies, std::bit_and, std::bit_or,
std::bit_xor, sycl::logical_and, sycl::logical_or, sycl::minimum, sycl::maximum, sycl::queue &>' requested here
271 | for_all_types(op_types,
| ^
../tests/reduction/reducer_api_core.cpp:79:33: note: in instantiation of member function 'check_reducer_identity::operator()' requested here
79 | check_reducer_identity{}(queue, "bool");
| ^
../tests/reduction/../common/disabled_for_test_case.h:42:3: note: expanded from macro 'DISABLED_FOR_TEST_CASE'
42 | INTERNAL_CTS_DISABLED_FOR_TEST_CASE(__VA_ARGS__)
| ^
../tests/reduction/../common/disabled_for_test_case.h:130:40: note: expanded from macro 'INTERNAL_CTS_DISABLED_FOR_TEST_CASE'
130 | INTERNAL_CTS_MAYBE_DISABLE_TEST_CASE(INTERNAL_CTS_ENABLED_TEST_CASE, \
| ^
1 warning generated.
```

Start with tests/reduction/identity_helper.h at lines 47-55 and reproduce the warning while building the reduction tests. Check the bool identity path used by reducer_api.h, then verify that the build completes without this warning and that the reduction tests still pass.

Written by the indexing model from the issue text.