chore: simplify method implementations using expression-bodied members

Author: DennisDyallo

Yubico.YubiKey/src/Yubico/YubiKey/Otp/Operations/CalculateChallengeResponse.cs

@@ -102,10 +102,7 @@ protected override void ExecuteOperation()
                 kb.TouchEvent += OnTouch;
             }
 
-            void OnTouch(object sender, EventArgs e)
-            {
-                _ = Task.Run(_touchNotify);
-            }
+            void OnTouch(object sender, EventArgs e) => _ = Task.Run(_touchNotify);
 
             try
             {

Yubico.YubiKey/src/Yubico/YubiKey/Otp/OtpSettings.cs

@@ -122,10 +122,7 @@ public YubiKeyFlags YubiKeyFlags
             // We would never use this for performance sensitive code,
             // but if we're throwing this exception, that's not a concern
             // here.
-            static int GetBitCount(Flag b)
-            {
-                return Convert.ToString((byte)b, 2).ToCharArray().Count(c => c == '1');
-            }
+            static int GetBitCount(Flag b) => Convert.ToString((byte)b, 2).ToCharArray().Count(c => c == '1');
         }
     }
 

Yubico.YubiKey/src/Yubico/YubiKey/Scp/Commands/ScpResponse.cs

@@ -49,9 +49,6 @@ public void ThrowIfFailed(string? message = null, bool includeStatusWord = true)
                         : message ?? StatusMessage);
         }
 
-        string AddStatusWord(string originalMessage)
-        {
-            return $"{originalMessage} (StatusWord: 0x{StatusWord:X2})";
-        }
+        string AddStatusWord(string originalMessage) => $"{originalMessage} (StatusWord: 0x{StatusWord:X2})";
     }
 }