[IDE] create KotlinLabelProviderService on request

getServiceIfCreated doesn't create a service instance if id wasn't
created before. There are no other service requests for
KotlinLabelProviderService, so it was not used for file types.

KTIJ-27755

analysis/decompiled/decompiler-to-psi/src/org/jetbrains/kotlin/analysis/decompiler/psi/KotlinLabelProviderService.kt

@@ -13,6 +13,6 @@ abstract class KotlinLabelProviderService {
 
     companion object {
         fun getService(): KotlinLabelProviderService? =
-            ApplicationManager.getApplication().getServiceIfCreated(KotlinLabelProviderService::class.java)
+            ApplicationManager.getApplication().getService(KotlinLabelProviderService::class.java)
     }
 }