KT-34692: Invoke ScratchAction::update without invokeLater

- `invokeLater` is bad here, since `AnAction::update` must update action look immediately, not later in the future
- Because of `invokeLater`, `RunScratchAction` wasn't properly rendered in the context menu
- `invokeLater` was added in the a24da280ca to fix EA-210180
  - EA-210180 is not reproducible; however, the main reason of the exception is that `AnAction::update` was called not from EDT, but from regular thread updating "Run From Here" (>>) gutter actions
  - all exception under EA-210180 are from 1.3.50; my guess is that those exceptions were caused by changes in scratch editor implementation details and will not appear again; if they will, we will need to investigate them
- ^KT-34692 Fixed

idea/idea-jvm/src/org/jetbrains/kotlin/idea/scratch/actions/ScratchAction.kt

@@ -15,7 +15,7 @@ import org.jetbrains.kotlin.idea.scratch.getScratchFileFromSelectedEditor
 import javax.swing.Icon
 
 abstract class ScratchAction(message: String, icon: Icon) : AnAction(message, message, icon) {
-    override fun update(e: AnActionEvent) = ApplicationManager.getApplication().invokeLater {
+    override fun update(e: AnActionEvent) {
         val scratchFile = e.getData(CommonDataKeys.EDITOR)
             ?.let { TextEditorProvider.getInstance().getTextEditor(it).getScratchFile() }
             ?: e.project?.let { getScratchFileFromSelectedEditor(it) }