ArrayInDataClass test: replace Arrays functions with Kotlin ones

This fixes relevant inspection test

idea/testData/inspectionsLocal/arrayInDataClass/test.kt.after

@@ -1,5 +1,3 @@
-import java.util.Arrays
-
 // WITH_RUNTIME
 
 data class A(val a: IntArray) {
@@ -9,12 +7,12 @@ data class A(val a: IntArray) {
 
         other as A
 
-        if (!Arrays.equals(a, other.a)) return false
+        if (!a.contentEquals(other.a)) return false
 
         return true
     }
 
     override fun hashCode(): Int {
-        return Arrays.hashCode(a)
+        return a.contentHashCode()
     }
 }