ConvertToAnonymousObjectFix: do not suggest when there is no lambda

#KT-31912 Fixed

idea/testData/quickfix/convertToAnonymousObject/lambdaInParentheses.kt.after

@@ -0,0 +1,12 @@
+// "Convert to anonymous object" "true"
+interface I {
+    fun foo(): String
+}
+
+fun test() {
+    val i = object : I {
+        override fun foo(): String {
+            return ""
+        }
+    }
+}