Fix: Dispose RxCommand having exceptions

Author: glennawatson

src/ReactiveUI/ReactiveCommand/ReactiveCommand.cs

@@ -628,8 +628,10 @@ public class ReactiveCommand<TParam, TResult> : ReactiveCommandBase<TParam, TRes
 {
     private readonly IObservable<bool> _canExecute;
     private readonly IDisposable _canExecuteSubscription;
+    [SuppressMessage("Design", "CA2213: Dispose member", Justification = "Internal use only")]
     private readonly ScheduledSubject<Exception> _exceptions;
     private readonly Func<TParam, IObservable<TResult>> _execute;
+    [SuppressMessage("Design", "CA2213: Dispose member", Justification = "Internal use only")]
     private readonly Subject<ExecutionInfo> _executionInfo;
     private readonly IObservable<bool> _isExecuting;
     private readonly IScheduler _outputScheduler;
@@ -779,8 +781,6 @@ protected override void Dispose(bool disposing)
             return;
         }
 
-        _executionInfo.Dispose();
-        _exceptions.Dispose();
         _canExecuteSubscription.Dispose();
     }