Update check-files and remove i18488.scala

i18488.scala was only passing because of the bug in the MatchReducer,
as we can see in the subtyping trace:
```
==> isSubType TableQuery[BaseCrudRepository.this.EntityTable] <:< Query[BaseCrudRepository.this.EntityTable, E[Option]]?
  ==> isSubType Query[BaseCrudRepository.this.EntityTable, Extract[BaseCrudRepository.this.EntityTable]] <:<
                Query[BaseCrudRepository.this.EntityTable, E[Option]] (left is approximated)?
    ==> isSubType E[Option] <:< Extract[BaseCrudRepository.this.EntityTable]?
      ==> isSubType [T[_$1]] =>> Any <:< Extract?
        ==> isSubType Any <:< Extract[T]?
          ==> isSubType Any <:< T match { case AbstractTable[t] => t } <: t (right is approximated)?
            ==> isSubType Any <:< <error Match type reduction failed since selector T
                                   matches none of the cases
                                   case AbstractTable[t] => t> (right is approximated)?
            <== isSubType Any <:< <error Match type reduction failed since selector T
                                   matches none of the cases
                                   case AbstractTable[t] => t> (right is approximated) = true
          <== isSubType Any <:< T match { case AbstractTable[t] => t } <: t (right is approximated) = true
        <== isSubType Any <:< Extract[T] = true
      <== isSubType [T[_$1]] =>> Any <:< Extract = true
      ...
    <== isSubType Extract[BaseCrudRepository.this.EntityTable] <:< E[Option] = true
  <== isSubType Query[BaseCrudRepository.this.EntityTable, Extract[BaseCrudRepository.this.EntityTable]] <:<
                Query[BaseCrudRepository.this.EntityTable, E[Option]] (left is approximated) = true
<== isSubType TableQuery[BaseCrudRepository.this.EntityTable] <:< Query[BaseCrudRepository.this.EntityTable, E[Option]] = true
```

tests/neg/i12049.check

@@ -18,7 +18,7 @@
 -- Error: tests/neg/i12049.scala:14:23 ---------------------------------------------------------------------------------
 14 |val y3: String = ??? : Last[Int *: Int *: Boolean *: String *: EmptyTuple]  // error
    |                       ^
-   |                       Match type reduction failed since selector EmptyTuple.type
+   |                       Match type reduction failed since selector EmptyTuple
    |                       matches none of the cases
    |
    |                           case _ *: _ *: t => Last[t]
@@ -48,7 +48,7 @@
 -- Error: tests/neg/i12049.scala:25:26 ---------------------------------------------------------------------------------
 25 |val _ = summon[String =:= Last[Int *: Int *: Boolean *: String *: EmptyTuple]] // error
    |                          ^
-   |                          Match type reduction failed since selector EmptyTuple.type
+   |                          Match type reduction failed since selector EmptyTuple
    |                          matches none of the cases
    |
    |                              case _ *: _ *: t => Last[t]

tests/neg/i13757-match-type-anykind.scala

@@ -1,11 +1,11 @@
 object Test:
-  type AnyKindMatchType1[X <: AnyKind] = X match // error: the scrutinee of a match type cannot be higher-kinded // error
+  type AnyKindMatchType1[X <: AnyKind] = X match // error: the scrutinee of a match type cannot be higher-kinded
     case Option[a] => Int
 
   type AnyKindMatchType2[X <: AnyKind] = X match // error: the scrutinee of a match type cannot be higher-kinded
     case Option => Int // error: Missing type parameter for Option
 
-  type AnyKindMatchType3[X <: AnyKind] = X match // error: the scrutinee of a match type cannot be higher-kinded // error
+  type AnyKindMatchType3[X <: AnyKind] = X match // error: the scrutinee of a match type cannot be higher-kinded
     case _ => Int
 
   type AnyKindMatchType4[X <: Option] = X match // error // error: the scrutinee of a match type cannot be higher-kinded // error