fix(tools): set base class for ReSharper dupfinder

[Matze693]

Fixed missing base class for ReSharper dupfinder to solve crash when using ReSharperDupFinder:

System.InvalidCastException: Unable to cast object of type 'Nuke.Common.Tools.ReSharper.ReSharperDupFinderSettings' to type 'Nuke.Common.Tools.ReSharper.ReSharperSettingsBase'.
   at Nuke.Common.Tools.ReSharper.ReSharperTasks.PreProcess(ToolOptions options) in /_/source/Nuke.Common/Tools/ReSharper/ReSharperTasks.cs:line 22
   at Nuke.Common.Tooling.ToolTasks.Run[T](ToolOptions options) in /_/source/Nuke.Tooling/ToolTasks.Run.cs:line 23
   at Nuke.Common.Tools.ReSharper.ReSharperTasks.ReSharperDupFinder(Configure`1 configurator) in /_/source/Nuke.Common/Tools/ReSharper/ReSharper.Generated.cs:line 49

I confirm that the pull-request:

• Follows the contribution guidelines
• Is based on my own work
• Is in compliance with my employer

[matkoch]

FYI, DupFinder has been sunsetted for a long time already.

[Matze693]

FYI, DupFinder has been sunsetted for a long time already.

I know, but I thought that as long as it is a part of Nuke, it should be able to execute. Alternatively, it can also be removed completely.