ffmpeg transpose=clock rotates 180 degrees instead 90
FFmpeg, by default, autorotates videos if a rotation tag is detected. The output video will be oriented upright and have no rotation tag. During processing, this step happens before any filtering is done.

So, in this case, you can simply run

ffmpeg -i 20180115_111730.mp4 -r 30 -acodec copy 20180115_111730_2.mp4


Alternatively, to perform manual rotation, you can suppress auto-rotation

ffmpeg -noautorotate -i 20180115_111730.mp4 -vf "transpose=clock" -r 30 -acodec copy 20180115_111730_2.mp4