Updated reference to InputClassificationAttribute

[vietle-bh]

Issues addressed by this PR

Closes #452

• Updated name of the InputClassificationAttribute attribute following its name change in Bhom_Engine.

  Test files

• Simply build the solution and see if it works.

  Changelog

• Updated name of an attribute following the name change in Bhom_Engine

[vietle-bh]

@BHoMBot check copyright-compliance @BHoMBot check project-compliance @BHoMBot check null-handling @BHoMBot check serialisation

[FraserGreenroyd]

@BHoMBot check copyright-compliance @BHoMBot check project-compliance @BHoMBot check null-handling @BHoMBot check serialisation

[bhombot-ci[bot]]

@FraserGreenroyd to confirm, the following actions are now queued: - check `copyright-compliance` - check `project-compliance` - check `null-handling` - check `serialisation`