bugfix: Remove entity.other.inherited-class.scala

[tgodzik]

Previously, symbol in inheritance clause would be treated differently than outside it. Now, they are all treated the same.

There are three reasons for that change:

• most themes don't have a specific color for entity.other.inherited-class.scala and it would end up the same color as string
• there is no reason to show the same symbol with different color aside from definition/declaration
• there is no sensible way to handle derives A, B, C or extends A, B, C and the first A would be colored differently

Fixes https://github.com/scala/vscode-scala-syntax/issues/239