Remove unused variable.

Terminal.Gui/ConsoleDrivers/CursesDriver/CursesDriver.cs

@@ -18,7 +18,6 @@ internal class CursesDriver : ConsoleDriver
     private MouseFlags _lastMouseFlags;
     private UnixMainLoop _mainLoopDriver;
     private object _processInputToken;
-    private bool _isSuspendRead;
 
     public override int Cols
     {

Terminal.Gui/ConsoleDrivers/FakeDriver/FakeDriver.cs

@@ -340,7 +340,6 @@ public class FakeDriver : ConsoleDriver
     }
 
     private CursorVisibility _savedCursorVisibility;
-    private bool _isSuspendRead;
 
     private void MockKeyPressedHandler (ConsoleKeyInfo consoleKeyInfo)
     {

Terminal.Gui/ConsoleDrivers/NetDriver.cs

@@ -1341,7 +1341,6 @@ internal class NetDriver : ConsoleDriver
     }
 
     private CursorVisibility? _cachedCursorVisibility;
-    private bool _isSuspendRead;
 
     public override void UpdateCursor ()
     {

Terminal.Gui/ConsoleDrivers/WindowsDriver.cs

@@ -1250,7 +1250,6 @@ internal class WindowsDriver : ConsoleDriver
     #region Cursor Handling
 
     private CursorVisibility? _cachedCursorVisibility;
-    private bool _isSuspendRead;
 
     public override void UpdateCursor ()
     {