Fix ADIOS Trait for bool

For default I/O and checkpointing via ADIOS, simulations using
our in situ radiation plugin with selected particles (by stride
or gamma) did not compile since ADIOS' C API does not define a
`bool` type for `radiationFlag`.

This adds a trait assuming it can be casted to one byte.

src/picongpu/include/traits/PICToAdios.tpp

@@ -32,6 +32,20 @@ namespace picongpu
 
 namespace traits
 {
+    template<>
+    struct PICToAdios<bool>
+    {
+        ADIOS_DATATYPES type;
+
+        PICToAdios() :
+        type(adios_unsigned_byte) {}
+
+        PMACC_STATIC_ASSERT_MSG(
+            sizeof(bool) == 1,
+            ADIOS_Plugin__Can_not_find_a_one_byte_representation_of_bool
+        );
+    };
+
     template<>
     struct PICToAdios<int32_t>
     {