Kotlin 2: Accept changes in library-tests/operator-overloads

This also brings the Kotlin 2 output back in line with the Kotlin 1
output.

Author: igfoo

java/ql/test-kotlin2/library-tests/operator-overloads/PrintAst.expected

@@ -12,9 +12,9 @@ test.kt:
 #    2|         0: [ExprStmt] <Expr>;
 #    2|           0: [ImplicitCoercionToUnitExpr] <implicit coercion to unit>
 #    2|             0: [TypeAccess] Unit
-#    2|             1: [MethodCall] get(...)
-#    2|               -1: [VarAccess] arr
-#    2|               0: [IntegerLiteral] 1
+#    2|             1: [ArrayAccess] ...[...]
+#    2|               0: [VarAccess] arr
+#    2|               1: [IntegerLiteral] 1
 #    3|         1: [ExprStmt] <Expr>;
 #    3|           0: [ImplicitCoercionToUnitExpr] <implicit coercion to unit>
 #    3|             0: [TypeAccess] Unit