Fix wildcards for invariant arguments

See test with Java, we want preserve the invariant that if return type and
value parameter types are same in Kotlin, than we can use such return-value
as argument for that parameter

compiler/testData/writeSignature/declarationSiteVariance/wildcardOptimization/arrays.kt

@@ -8,7 +8,7 @@ open class Open
 
 fun arrayOfOutOpen(x: Array<Out<Open>>) {}
 // method: ArraysKt::arrayOfOutOpen
-// generic signature: ([LOut<+LOpen;>;)V
+// generic signature: ([LOut<LOpen;>;)V
 
 fun arrayOfOutFinal(x: Array<Out<Final>>) {}
 // method: ArraysKt::arrayOfOutFinal