Apps use the wrong theme for the system context menu

### Describe the bug

Apps on a system that is configured to use the dark theme use the light system context menu theme:

Context menu looks like this:

When it should look like this:

### Steps to reproduce the bug

Create a new project on a system that is configured to use dark mode.

### Expected behavior

_No response_

### Screenshots

_No response_

### NuGet package version

1.1.4

### Packaging type

Packaged (MSIX), Unpackaged

### Windows version

Windows 10 version 21H2 (19044, November 2021 Update)

### IDE

Visual Studio 2022

### Additional context

The right theme for the context menue is chosen when you call into an undocumented function in uxtheme.dll:

```cs
[DllImport("uxtheme.dll", EntryPoint = "#135", SetLastError = true, CharSet = CharSet.Unicode)]
private static extern int SetPreferredAppMode(int preferredAppMode);
```

According to [this](https://github.com/ysc3839/win32-darkmode/blob/cc26549b65b25d6f3168a80238792545bd401271/win32-darkmode/DarkMode.h#L11) there are a number of values for the int parameter.

Call this function on program start to choose the right mode for the current configuration.