Remove LANGUAGE_VERSION directive from blackBox codegen tests

compiler/testData/codegen/box/constants/kt9532_lv10.kt

@@ -1,6 +1,6 @@
+// !LANGUAGE: -InlineConstVals
 // TODO: muted automatically, investigate should it be ran for JS or not
 // IGNORE_BACKEND: JS
-// LANGUAGE_VERSION: 1.0
 
 object A {
     const val a: String = "$"

compiler/testData/codegen/box/nullabilityAssertions/incWithNullabilityAssertionOnExtensionReceiverInPrivateOperator_lv11.kt

@@ -1,7 +1,7 @@
+// !LANGUAGE: -NullabilityAssertionOnExtensionReceiver
 // TARGET_BACKEND: JVM
 // FILE: test.kt
 // WITH_RUNTIME
-// LANGUAGE_VERSION: 1.1
 private operator fun A.inc() = A()
 
 fun box(): String {

compiler/testData/codegen/box/nullabilityAssertions/nullabilityAssertionOnExtensionReceiver_lv11.kt

@@ -1,7 +1,7 @@
+// !LANGUAGE: -NullabilityAssertionOnExtensionReceiver
 // TARGET_BACKEND: JVM
 // WITH_RUNTIME
 // FILE: test.kt
-// LANGUAGE_VERSION: 1.1
 import kotlin.test.*
 
 fun String.extension() {}

compiler/testData/codegen/box/nullabilityAssertions/nullabilityAssertionOnInlineFunExtensionReceiver_lv11.kt

@@ -1,7 +1,7 @@
+// !LANGUAGE: -NullabilityAssertionOnExtensionReceiver
 // TARGET_BACKEND: JVM
 // WITH_RUNTIME
 // FILE: test.kt
-// LANGUAGE_VERSION: 1.1
 import kotlin.test.*
 
 inline fun String.extension() {}

compiler/testData/codegen/box/platformTypes/primitives/equalsNull_lv11.kt

@@ -1,4 +1,4 @@
-// LANGUAGE_VERSION: 1.1
+// !LANGUAGE: -ThrowNpeOnExplicitEqualsForBoxedNull
 // TARGET_BACKEND: JVM
 // WITH_RUNTIME
 // FILE: test.kt