Actually use cache.

Previously the condition to use cache is never met.

src/onig-scanner.cc

@@ -78,7 +78,7 @@ Handle<Value> OnigScanner::FindNextMatch(Handle<String> v8String, Handle<Number>
  bool useCachedResult = false;
  shared_ptr<OnigResult> result;
 
- if (useCachedResults && index <= maxCachedIndex) {
+ if (index <= maxCachedIndex) {
  result = cachedResults[index];
  useCachedResult = (!result || result->LocationAt(0) >= charOffset);
  }