Partially revert 475dd93e

This introduces ./validate failures for Windows right now, so in the
mean time let's just back this flag out as a default -Wall flag.
Signed-off-by: Austin Seipp <austin@well-typed.com>

compiler/main/DynFlags.hs

@@ -3154,8 +3154,7 @@ minusWallOpts
         Opt_WarnMissingSigs,
         Opt_WarnHiShadows,
         Opt_WarnOrphans,
-        Opt_WarnUnusedDoBind,
-        Opt_WarnTrustworthySafe
+        Opt_WarnUnusedDoBind
       ]
 
 enableGlasgowExts :: DynP ()