fix seektime tolerance

Author: keenjoe007

ios/RCTVideo.m

@@ -561,12 +561,11 @@ - (void)setSeek:(float)seekTime
     CMTime cmSeekTime = CMTimeMakeWithSeconds(seekTime, timeScale);
     CMTime current = item.currentTime;
     // TODO figure out a good tolerance level
-    CMTime tolerance = CMTimeMake(1000, timeScale);
     BOOL wasPaused = _paused;
 
     if (CMTimeCompare(current, cmSeekTime) != 0) {
       if (!wasPaused) [_player pause];
-      [_player seekToTime:cmSeekTime toleranceBefore:tolerance toleranceAfter:tolerance completionHandler:^(BOOL finished) {
+      [_player seekToTime:cmSeekTime toleranceBefore:kCMTimeZero toleranceAfter:kCMTimeZero completionHandler:^(BOOL finished) {
         if (!wasPaused) [_player play];
         if(self.onVideoSeek) {
             self.onVideoSeek(@{@"currentTime": [NSNumber numberWithFloat:CMTimeGetSeconds(item.currentTime)],