wiggle: bugfix, generated code should use Names::runtime_mod not wiggle

as the crate from which these deps come.

I worked around this in lucet, but I'll be able to revert that
workaround.

crates/wiggle/generate/src/module_trait.rs

@@ -69,7 +69,8 @@ pub fn define_module_trait(names: &Names, m: &Module, errxform: &ErrorTransform)
                 .unwrap_or(quote!(()));
             quote!( Result<(#(#rets),*), #err> )
         } else {
-            quote!(wiggle::Trap)
+            let rt = names.runtime_mod();
+            quote!(#rt::Trap)
         };
 
         if is_anonymous {