Use implicit copy-constructor generated by compiler

This also suppresses the following clang warning:
warning: definition of implicit copy assignment operator for 'Version<unsigned short, 2>' is deprecated because it has a user-declared copy constructor [-Wdeprecated-copy]

src/base/bittorrent/infohash.h

@@ -64,7 +64,6 @@ namespace BitTorrent
 #endif
 
         InfoHash() = default;
-        InfoHash(const InfoHash &other) = default;
         InfoHash(const WrappedType &nativeHash);
 
         bool isValid() const;

src/base/digest32.h

@@ -41,7 +41,6 @@ public:
     using UnderlyingType = lt::digest32<N>;
 
     Digest32() = default;
-    Digest32(const Digest32 &other) = default;
 
     Digest32(const UnderlyingType &nativeDigest)
         : m_valid {true}

src/base/utils/version.h

@@ -48,12 +48,7 @@ namespace Utils
         typedef T ComponentType;
         typedef Version<T, N, Mandatory> ThisType;
 
-        constexpr Version()
-            : m_components {{}}
-        {
-        }
-
-        constexpr Version(const ThisType &other) = default;
+        constexpr Version() = default;
 
         template <typename ... Other>
         constexpr Version(Other ... components)
@@ -187,7 +182,7 @@ namespace Utils
         {
         }
 
-        ComponentsArray m_components;
+        ComponentsArray m_components {{}};
     };
 
     template <typename T, std::size_t N, std::size_t Mandatory>