Fixes incorrect cast of parameters in CommandBuilder (#3015)

Author: gehongyan

src/Discord.Net.Interactions/Builders/Commands/CommandBuilder.cs

@@ -185,7 +185,7 @@ ICommandBuilder ICommandBuilder.WithNameAsRegex(bool value) =>
 
         /// <inheritdoc/>
         ICommandBuilder ICommandBuilder.AddParameters(params IParameterBuilder[] parameters) =>
-            AddParameters(parameters as TParamBuilder);
+            AddParameters(parameters as TParamBuilder[]);
 
         /// <inheritdoc/>
         ICommandBuilder ICommandBuilder.WithPreconditions(params PreconditionAttribute[] preconditions) =>