sensors/bmp388: Fix set_odr_filter_settings
sensors/bmp388: Fix set_odr_filter_settings

Function could report error when settings did not changed.
In this case bmp3_set_regs() would be called with len == 0
and that would be wrongly reported as error.

mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core