test: iwyu docet

test/entt/entity/view.cpp

@@ -2,7 +2,6 @@
 #include <array>
 #include <iterator>
 #include <tuple>
-#include <type_traits>
 #include <utility>
 #include <gtest/gtest.h>
 #include <common/boxed_type.h>

test/entt/meta/meta_context.cpp

@@ -9,6 +9,7 @@
 #include <entt/meta/container.hpp>
 #include <entt/meta/context.hpp>
 #include <entt/meta/factory.hpp>
+#include <entt/meta/meta.hpp>
 #include <entt/meta/pointer.hpp>
 #include <entt/meta/resolve.hpp>
 #include <entt/meta/template.hpp>

test/entt/meta/meta_type.cpp

@@ -1,7 +1,6 @@
 #include <algorithm>
 #include <map>
 #include <memory>
-#include <type_traits>
 #include <utility>
 #include <vector>
 #include <gtest/gtest.h>