Simplify and fix "recursive equals" inspection (related to KT-13702)

idea/testData/inspectionsLocal/recursiveEqualsCall/recursiveFake.kt

@@ -0,0 +1,9 @@
+// PROBLEM: none
+
+class Test {
+    override fun equals(other: Any?): Boolean {
+        val another = Test()
+        if (<caret>another == other) return true
+        return false
+    }
+}