Match simdjson behavior for surrogate pairs

As far as I can tell

src/fuzz.cpp

@@ -83,10 +83,6 @@ void compareWithSimdjson(std::string const &json) {
       // This gets returned for precision errors sometimes?
       return;
     }
-    if (theirs == simdjson::STRING_ERROR) {
-      // why god why god do I gotta suffer
-      return;
-    }
     if (theirs == simdjson::NUMBER_OUT_OF_RANGE) {
       // We don't validate the precision of numbers
       return;