[MouseUtils]rename "crosshair"->"crosshairs" (#15761)

* [MouseUtils]rename "crosshair"->"crosshairs"

* Fix crosshairss isnstances in logs

src/settings-ui/Settings.UI.Library/SndMousePointerCrosshairsSettings.cs

@@ -0,0 +1,29 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Microsoft.PowerToys.Settings.UI.Library
+{
+    public class SndMousePointerCrosshairsSettings
+    {
+        [JsonPropertyName("MousePointerCrosshairs")]
+        public MousePointerCrosshairsSettings MousePointerCrosshairs { get; set; }
+
+        public SndMousePointerCrosshairsSettings()
+        {
+        }
+
+        public SndMousePointerCrosshairsSettings(MousePointerCrosshairsSettings settings)
+        {
+            MousePointerCrosshairs = settings;
+        }
+
+        public string ToJsonString()
+        {
+            return JsonSerializer.Serialize(this);
+        }
+    }
+}