Fix compilation warning

src_nbgl/ui_sign_712.c

@@ -23,6 +23,7 @@ static void reviewChoice(bool confirm) {
   }
 }
 static bool displaySignPage(uint8_t page, nbgl_pageContent_t *content) {
+  (void)page;
   content->type = INFO_LONG_PRESS,
   content->infoLongPress.icon = &ICONGLYPH;
   content->infoLongPress.text = "Sign typed message";