testsuite: Drop constraint in kind from T15862

We only started allowing constraints in kinds in
6cce36f8, which is not present in 8.8.

testsuite/tests/typecheck/should_fail/T15862.hs

@@ -29,8 +29,3 @@ data Quux = MkQuux (# Bool | Int #)
 quux :: TypeRep MkQuux
 quux = typeRep
 
-data Quuz :: (Type ~ Type) => Type where
-  MkQuuz :: Quuz
-
-quuz :: TypeRep MkQuuz
-quuz = typeRep

testsuite/tests/typecheck/should_fail/T15862.stderr

@@ -19,10 +19,3 @@ T15862.hs:30:8: error:
           Typeable ('MkQuux :: (# Bool | Int #) -> Quux)
     • In the expression: typeRep
       In an equation for ‘quux’: quux = typeRep
-
-T15862.hs:36:8: error:
-    • No instance for (Typeable 'MkQuuz)
-        arising from a use of ‘typeRep’
-        GHC can't yet do polykinded Typeable ('MkQuuz :: Quuz)
-    • In the expression: typeRep
-      In an equation for ‘quuz’: quuz = typeRep