Scratch: do not clear inlays in onStart

This is needed for sequential executor

idea/idea-jvm/src/org/jetbrains/kotlin/idea/scratch/compile/KtCompilingExecutor.kt

@@ -34,6 +34,7 @@ class KtCompilingExecutor(file: ScratchFile) : ScratchExecutor(file) {
     private var session: KtScratchExecutionSession? = null
 
     override fun execute() {
+        handler.clear(file)
         handler.onStart(file)
 
         session = KtScratchExecutionSession(file, this)

idea/idea-jvm/src/org/jetbrains/kotlin/idea/scratch/output/InlayScratchOutputHandler.kt

@@ -29,7 +29,6 @@ object InlayScratchOutputHandler : ScratchOutputHandler {
     private const val minSpaceCount = 4
 
     override fun onStart(file: ScratchFile) {
-        clear(file)
     }
 
     override fun handle(file: ScratchFile, expression: ScratchExpression, output: ScratchOutput) {