Kotlin migration: fix data context calculation for 173 / AS31

Version for IDEA 182 does not work properly here (returns null),
so we have to use `DataManager.getDataContext(focusedComponent)` directly

#KT-26399 Fixed

idea/src/org/jetbrains/kotlin/idea/configuration/MigrationUtils.kt.173

@@ -0,0 +1,14 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.idea.configuration
+
+import com.intellij.ide.DataManager
+import com.intellij.openapi.actionSystem.DataContext
+import com.intellij.openapi.ui.DialogWrapper
+
+@Suppress("UNUSED_PARAMETER")
+internal fun getDataContextFromDialog(wrapper: DialogWrapper): DataContext? =
+    DataManager.getInstance().getDataContext(wrapper.window)