fix: missing interpolation (generate_single_ux_field, mask -> #mask_name)

src/generator/codegen_register.rs

@@ -299,7 +299,7 @@ fn generate_single_ux_field(
         pub fn #setter_name(&self, val: #field_type) -> Self {
             let update: #base_type = val & #mask_name;
             let mut inner = self.inner;
-            inner &= !mask;
+            inner &= !#mask_name;
             inner |= update;
             Self { inner }
         }