[FE 1.0] Drop ArrayLiteralsInAnnotations feature

This feature was introduced in 1.2, so now it's stable part of language
  and we can drop support of disabling it

compiler/testData/diagnostics/tests/collectionLiterals/resolveToFunctionFromBuiltIns.kt

@@ -1,5 +1,4 @@
 // FIR_IDENTICAL
-// !LANGUAGE: +ArrayLiteralsInAnnotations
 // !DIAGNOSTICS: -UNUSED_VARIABLE, -UNSUPPORTED
 
 annotation class Anno(val a: Array<String> = [""], val b: IntArray = [])
@@ -16,4 +15,4 @@ fun local() {
 
     val s1: Array<String> = [""]
     val s2: Array<String> = []
-}
+}