Removed ownjsonSerializer from WindowManager

Removed the unneeded serializer and applied the settings to the global
this._jsonSerializer as when the X and Y values are -1 in the options
it would lead to some settings not being applied. E.g. ContextIsolation
with it now applying the default values when serializing, settings
mentioned before are correctly assigned on Electron's end

Author: NimbusFox

src/ElectronNET.API/API/WindowManager.cs

@@ -153,12 +153,7 @@ public async Task<BrowserWindow> CreateWindowAsync(BrowserWindowOptions options,
                     options.X -= 7;
                 }
 
-                var ownjsonSerializer = new JsonSerializer()
-                {
-                    ContractResolver = new CamelCasePropertyNamesContractResolver(),
-                    NullValueHandling = NullValueHandling.Ignore
-                };
-                await BridgeConnector.Socket.Emit("createBrowserWindow", JObject.FromObject(options, ownjsonSerializer), loadUrl).ConfigureAwait(false);
+                await BridgeConnector.Socket.Emit("createBrowserWindow", JObject.FromObject(options, this._jsonSerializer), loadUrl).ConfigureAwait(false);
             }
 
             return await taskCompletionSource.Task.ConfigureAwait(false);
@@ -216,8 +211,7 @@ public async Task<BrowserView> CreateBrowserViewAsync(BrowserViewConstructorOpti
         private readonly JsonSerializer _jsonSerializer = new()
         {
             ContractResolver = new CamelCasePropertyNamesContractResolver(),
-            NullValueHandling = NullValueHandling.Ignore,
-            DefaultValueHandling = DefaultValueHandling.Ignore
+            NullValueHandling = NullValueHandling.Ignore
         };
     }
 }