Revert "Additional simple test for variable initialize in secondary constructor"

This reverts commit 147f170f80.

compiler/testData/diagnostics/tests/secondaryConstructors/initializeValInConstructor.kt

@@ -1,6 +0,0 @@
-class A {
-    val x: Int
-    constructor(x: Int) {
-        this.x = x
-    }
-}

compiler/testData/diagnostics/tests/secondaryConstructors/initializeValInConstructor.txt

@@ -1,9 +0,0 @@
-package
-
-public final class A {
-    public constructor A(/*0*/ x: kotlin.Int, /*1*/ y: kotlin.Int)
-    public final val x: kotlin.Int
-    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
-}