improvements in copying of behaviour contexts

tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/BehaviourContext.kt

@@ -123,6 +123,7 @@ class DefaultBehaviourContext(
         onBufferOverflow = onBufferOverflow,
         upstreamUpdatesFlow = upstreamUpdatesFlow,
         triggersHolder = triggersHolder,
+        data = BehaviourContextData().apply { include(this@DefaultBehaviourContext.data) },
         subcontextInitialAction = subcontextInitialAction
     ).apply {
         data.include(this@DefaultBehaviourContext.data)