App crash when using CROP tool on a second monitor with diferent DPI

[npn-npn]

System information:

• Windows OS version: Windows 11 x64 (Microsoft Windows NT 10.0.22631.0 64-bit)
• ImageGlass version: v9.0.10.201

To Reproduce

Steps to reproduce the behavior:

1. Open and Image on a second monitor (different DPI)
2. Try to select "Crop" tool
3. ImageGlass crashes (below the reported error)

Actual behavior:

Expected behavior:

Screenshots:

Additional context:

Version: ImageGlass v9.0.10.201
Release code: kobe
Magick.NET: Magick.NET Q16-HDRI-OpenMP x64 netstandard21 13.5.0
WebView2 Runtime: 122.0.2365.80
OS: Microsoft Windows NT 10.0.22631.0 64-bit

Error: Object reference not set to an instance of an object.

System.NullReferenceException: Object reference not set to an instance of an object.
at ImageGlass.FrmCrop.ApplyTheme(Boolean darkMode, Nullable`1 style) in D:_GITHUB@d2phap\ImageGlass\Source\ImageGlass\Tools\FrmCrop.cs:line 65
at ImageGlass.FrmCrop.OnDpiChanged(DpiChangedEventArgs e) in D:_GITHUB@d2phap\ImageGlass\Source\ImageGlass\Tools\FrmCrop.cs:line 95
at System.Windows.Forms.Form.WmDpiChanged(Message& m)
at ImageGlass.UI.ModernForm.WndProc(Message& m) in D:_GITHUB@d2phap\ImageGlass\Source\Components\ImageGlass.UI\Forms\ModernForm.cs:line 200
at System.Windows.Forms.NativeWindow.Callback(HWND hWnd, MessageId msg, WPARAM wparam, LPARAM lparam)

[alessandro-antonelli]

Probably a duplicate of #1758 ?