Remove LANGUAGE_VERSION from boxInline tests

compiler/testData/codegen/boxInline/defaultValues/lambdaInlining/receiverClashInClass.kt

@@ -1,6 +1,5 @@
 // IGNORE_BACKEND: JVM_IR
 // FILE: 1.kt
-// LANGUAGE_VERSION: 1.2
 // SKIP_INLINE_CHECK_IN: inlineFun$default
 package test
 
@@ -22,4 +21,4 @@ import test.*
 fun box(): String {
     val result = with(A("VALUE")) { "OK".inlineFun() }
     return if (result == "VALUE OK OK") "OK" else "fail 1: $result"
-}
+}