Convert to anonymous object: don't remove type arguments

#KT-30208 Fixed

idea/testData/intentions/samConversionToAnonymousObject/typeArgument.1.java

@@ -0,0 +1,3 @@
+public interface A <T, U> {
+    U foo(T x);
+}

idea/testData/intentions/samConversionToAnonymousObject/typeArgument.1.java.after

@@ -0,0 +1,3 @@
+public interface A <T, U> {
+    U foo(T x);
+}

idea/testData/intentions/samConversionToAnonymousObject/typeArgument.kt

@@ -0,0 +1 @@
+val a = <caret>A<Int, String> { "" }

idea/testData/intentions/samConversionToAnonymousObject/typeArgument.kt.after

@@ -0,0 +1,5 @@
+val a = object : A<Int, String> {
+    override fun foo(it: Int): String {
+        return ""
+    }
+}