Revert "[FIR] Implement INVISIBLE_SETTER"

This reverts commit b3d7ed56

compiler/testData/diagnostics/tests/scopes/invisibleSetter.fir.kt

@@ -0,0 +1,9 @@
+class A<T> {
+    public var x: Int = 0
+        private set
+}
+
+fun main() {
+    val a = A<Any>()
+    a.x = 1
+}