test: minor changes (code coverage purposes)

Author: skypjack

test/entt/meta/meta_any.cpp

@@ -71,9 +71,11 @@ enum class enum_class : unsigned short int {
 
 struct unmanageable_t {
     unmanageable_t() = default;
-    ~unmanageable_t() = default;
+    virtual ~unmanageable_t() = default;
+
     unmanageable_t(const unmanageable_t &) = delete;
     unmanageable_t(unmanageable_t &&) = delete;
+
     unmanageable_t &operator=(const unmanageable_t &) = delete;
     unmanageable_t &operator=(unmanageable_t &&) = delete;
 };
@@ -1303,7 +1305,7 @@ TEST_F(MetaAny, EnumConversion) {
 }
 
 TEST_F(MetaAny, UnmanageableType) {
-    unmanageable_t instance;
+    unmanageable_t instance{};
     auto any = entt::forward_as_meta(instance);
     entt::meta_any other = any.as_ref();