KT-6393 Smart completion of anonymous object inserts type with "!" for type parameter

#KT-6393 Fixed

idea/idea-completion/testData/smartMultiFile/AnonymousObjectGenericJava/AnonymousObjectGenericJava.java

@@ -0,0 +1,4 @@
+class JavaClass<T> {
+    JavaClass(Comparator<T> comparator) {
+    }
+}

idea/idea-completion/testData/smartMultiFile/AnonymousObjectGenericJava/AnonymousObjectGenericJava.kt

@@ -0,0 +1,5 @@
+fun f(){
+    JavaClass<String>(<caret>)
+}
+
+// EXIST: { itemText: "object: Comparator<String?>{...}" }

idea/idea-completion/testData/smartMultiFile/AnonymousObjectGenericJava/Comparator.kt

@@ -0,0 +1,3 @@
+public trait Comparator<T> {
+    public fun compare(var1: T, var2: T): Int
+}