[JS TESTS] Remove LANGUAGE_VERSION directive

Some of them are not necessary at all, others can be replaced with
`!LANGUAGE` directive with exclusion of corresponding features.

js/js.translator/testData/box/inlineMultiModule/inlineMemberFunWithLambda.kt

@@ -1,6 +1,5 @@
 // IGNORE_BACKEND: JS_IR_ES6
 // EXPECTED_REACHABLE_NODES: 1397
-// LANGUAGE_VERSION: 1.2
 // MODULE: lib
 // FILE: lib.kt
 open class C {