Update repl check files

Deleting an error message changes all subsequent error message umbers,
which means that REPL tests were invalidated. This is a bit unfortunate
from a testing standpoint.

Author: odersky

tests/repl/errmsgs.check

@@ -86,7 +86,7 @@ scala> val x: List[Int] = "foo" :: List(1)
   |                   required: Int
   |                   
 scala> { def f: Int = g; val x: Int = 1; def g: Int = 5; }
--- [E039] Reference Error: <console> -------------------------------------------
+-- [E038] Reference Error: <console> -------------------------------------------
 5 |{ def f: Int = g; val x: Int = 1; def g: Int = 5; }
   |               ^
   |           `g` is a forward reference extending over the definition of `x`

tests/repl/overrides.check

@@ -1,5 +1,5 @@
 scala> class B { override def foo(i: Int): Unit = {}; }
--- [E037] Reference Error: <console> -------------------------------------------
+-- [E036] Reference Error: <console> -------------------------------------------
 4 |class B { override def foo(i: Int): Unit = {}; }
   |                       ^
   |                       method foo overrides nothing
@@ -8,7 +8,7 @@ longer explanation available when compiling with `-explain`
 scala> class A { def foo: Unit = {}; }
 defined class A
 scala> class B extends A { override def foo(i: Int): Unit = {}; }
--- [E038] Reference Error: <console> -------------------------------------------
+-- [E037] Reference Error: <console> -------------------------------------------
 5 |class B extends A { override def foo(i: Int): Unit = {}; }
   |                                 ^
   |      method foo has a different signature than the overridden declaration