JS: deparenthesize LHS of assignment before choosing appropriate AccessTranslator. Fix KT-15169

compiler/testData/codegen/box/operatorConventions/annotatedAssignment.kt

@@ -0,0 +1,13 @@
+@Target(AnnotationTarget.EXPRESSION)
+annotation class Annotation
+
+fun box(): String {
+    var v = 0
+    @Annotation v += 1 + 2
+    if (v != 3) return "fail1"
+
+    @Annotation v = 4
+    if (v != 4) return "fail2"
+
+    return "OK"
+}