always use last maxBitrate value to limit published bitrate

[zhangyihui1]

1: android join room 2: publish localstream with video codec h264 and maxBitrate 1000: VideoEncodingParameters h264 = new VideoEncodingParameters(new VideoCodecParameters( H264),1000); VideoEncodingParameters vp8 = new VideoEncodingParameters(new VideoCodecParameters( VP8),1500); options = PublishOptions.builder().addVideoParameter(h264) .build();

3: get publication getStats to check bitrate

expect : bitrate close to 1000 actual : bitrate close to 1500