KT-8574 'Convert to block body' inserts spurious < token

#KT-8574 Fixed

idea/testData/intentions/convertToBlockBody/valueIsAnonymousObject4.kt.after

@@ -0,0 +1,7 @@
+// WITH_RUNTIME
+
+interface I
+
+fun f(): List<I> {
+    return listOf(object : I { })
+}