Fix sjs checks

Author: som-snytt

tests/neg-scalajs/js-native-members.check

@@ -56,7 +56,7 @@
 13 |  def c: Int = 3 // error
    |               ^
    |               Concrete members of JS native types may only call js.native.
--- Error: tests/neg-scalajs/js-native-members.scala:14:23 --------------------------------------------------------------
+-- Error: tests/neg-scalajs/js-native-members.scala:14:25 --------------------------------------------------------------
 14 |  def d(x: Int): Int = x + 1 // error
    |                       ^^^^^
    |                       Concrete members of JS native types may only call js.native.

tests/neg-scalajs/js-native-val-defs.check

@@ -6,7 +6,7 @@
 11 |  def b: Int = 3 // error
    |               ^
    |               @js.native members may only call js.native.
--- Error: tests/neg-scalajs/js-native-val-defs.scala:14:23 -------------------------------------------------------------
+-- Error: tests/neg-scalajs/js-native-val-defs.scala:14:25 -------------------------------------------------------------
 14 |  def c(x: Int): Int = x + 1 // error
    |                       ^^^^^
    |                       @js.native members may only call js.native.

tests/neg-scalajs/js-trait-members.check

@@ -22,7 +22,7 @@
 12 |  var c2: Int = 5 // error
    |  ^^^^^^^^^^^^^^^
    |  Members of non-native JS traits must either be abstract, or their right-hand-side must be `js.undefined`.
--- Error: tests/neg-scalajs/js-trait-members.scala:14:24 ---------------------------------------------------------------
+-- Error: tests/neg-scalajs/js-trait-members.scala:14:26 ---------------------------------------------------------------
 14 |  def d1(x: Int): Int = x + 1 // error
    |                        ^^^^^
    |                        In non-native JS traits, defs with parentheses must be abstract.