Libraries: Use default constructors/destructors in LibELF

https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#cother-other-default-operation-rules

"The compiler is more likely to get the default semantics right and
you cannot implement these functions better than the compiler."

Userland/Libraries/LibELF/DynamicObject.h

@@ -1,6 +1,7 @@
 /*
  * Copyright (c) 2019-2020, Andrew Kaster <akaster@serenityos.org>
  * Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
+ * Copyright (c) 2022, the SerenityOS developers.
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -107,7 +108,7 @@ public:
             , m_name(name)
         {
         }
-        ~Section() { }
+        ~Section() = default;
 
         StringView name() const { return m_name; }
         unsigned offset() const { return m_section_offset; }