Move "Work-around for GHC 9.4 bug in ExpWithClashCF"

Moves the workaround added in c1ef28f
from Exp.hs to ExpWithGhcCF.hs

When I updated the CI image from 9.4.3 to 9.4.6 the ExpWithGhcCF test
started to fail on the 9.4.6 nightly test with
    Other error:
    panic! (the 'impossible' happened)
      GHC version 9.4.6:
    	refineFromInScope

I've done some testing and I've found:
Using ghc <= 9.4.4:
 The -fno-specialise workaround isn't need at all

Using ghc 9.4.5 and 9.4.6:
 It needs the -fno-specialise workaround in ExpWithGhcCF, not in Exp.
 Otherwise the ExpWithGhcCF test fails,
 not the ExpWithClashCF like mentioned in the original commit msg.

tests/shouldwork/Numbers/Exp.hs

@@ -4,7 +4,6 @@
 {-# LANGUAGE PartialTypeSignatures #-}
 
 {-# OPTIONS_GHC -Wno-partial-type-signatures #-}
-{-# OPTIONS_GHC -fno-specialise #-} -- TODO: remove when https://gitlab.haskell.org/ghc/ghc/-/issues/23109#note_499130 is fixed
 
 {-# OPTIONS_GHC -fplugin=GHC.TypeLits.Extra.Solver #-}
 {-# OPTIONS_GHC -fplugin=GHC.TypeLits.Normalise #-}

tests/shouldwork/Numbers/ExpWithGhcCF.hs

@@ -1,4 +1,5 @@
 {-# LANGUAGE CPP #-}
+{-# OPTIONS_GHC -fno-specialise #-} -- TODO: remove when https://gitlab.haskell.org/ghc/ghc/-/issues/23109#note_499130 is fixed
 
 module ExpWithGhcCF where
 import Clash.Prelude