Fixed KT-2483 "Add import" quick fix offers adding import to non-API class

#KT-2483 Fixed

idea/testData/quickfix/autoImports/noImportForNestedInPrivate.after.kt

@@ -0,0 +1,6 @@
+// "class com.intellij.codeInsight.daemon.impl.quickfix.ImportClassFixBase" "false"
+// ERROR: Unresolved reference: Nested
+
+fun test() {
+    Nested
+}

idea/testData/quickfix/autoImports/noImportForNestedInPrivate.before.Main.kt

@@ -0,0 +1,10 @@
+// "class com.intellij.codeInsight.daemon.impl.quickfix.ImportClassFixBase" "false"
+// ACTION: Create local variable 'Nested'
+// ACTION: Create object 'Nested'
+// ACTION: Create parameter 'Nested'
+// ACTION: Create property 'Nested'
+// ERROR: Unresolved reference: Nested
+
+fun test() {
+    <caret>Nested
+}

idea/testData/quickfix/autoImports/noImportForNestedInPrivate.before.data.Sample.kt

@@ -0,0 +1,5 @@
+package sometest
+
+private class PrivateClass {
+    class Nested
+}