ModernKeePassLib implements HMAC correctly

Blake2b also implemented, but not tested
ModernKeePass app better implements focus on database password box (but still not working correctly)

ModernKeePassLib/Cryptography/Cipher/ChaCha20Engine.cs

@@ -122,7 +122,7 @@ namespace ModernKeePassLib.Cryptography.Cipher
 					m_c.Dispose();
 					m_c = null;
 
-					//m_sBase.Close();
+					m_sBase.Dispose();
 					m_sBase = null;
 				}