feat: Address Rule CS0649

https://github.com/AvaloniaUI/Avalonia/discussions/9990#discussioncomment-4701870

src/Avalonia.FreeDesktop/DBusIme/DBusTextInputMethodBase.cs

@@ -34,7 +34,7 @@ namespace Avalonia.FreeDesktop.DBusIme
         private bool _connecting;
         private string? _currentName;
         private DBusCallQueue _queue;
-        private bool _controlActive, _windowActive;
+        private bool _windowActive;
         private bool? _imeActive;
         private Rect _logicalRect;
         private PixelRect? _lastReportedRect;
@@ -189,7 +189,7 @@ namespace Avalonia.FreeDesktop.DBusIme
                 if(!IsConnected)
                     return;
                 
-                var active = _windowActive && _controlActive;
+                var active = _windowActive && IsActive;
                 if (active != _imeActive)
                 {
                     _imeActive = active;

src/Avalonia.X11/X11Window.Xim.cs

@@ -13,7 +13,7 @@ namespace Avalonia.X11
         class XimInputMethod : ITextInputMethodImpl, IX11InputMethodControl
         {
             private readonly X11Window _parent;
-            private bool _controlActive, _windowActive, _imeActive;
+            private bool _windowActive, _imeActive;
             private Rect? _queuedCursorRect;
             private ITextInputMethodClient? _client;
 
@@ -70,7 +70,7 @@ namespace Avalonia.X11
 
             private void UpdateActive()
             {
-                var active = _windowActive && _controlActive;
+                var active = _windowActive && IsActive;
                 if(_parent._xic == IntPtr.Zero)
                     return;
                 if (active != _imeActive)