Remove evaluator from script definition, simplify interface

plugins/scripting/scripting-cli/src/org/jetbrains/kotlin/scripting/compiler/plugin/LazyScriptDefinitionFromDiscoveredClass.kt

@@ -75,6 +75,5 @@ class LazyScriptDefinitionFromDiscoveredClass internal constructor(
 
 object InvalidScriptDefinition : ScriptDefinition {
     override val properties: ScriptDefinitionPropertiesBag = ScriptDefinitionPropertiesBag()
-    override val evaluator: ScriptEvaluator<*>? = null
 }