reduce 1.6 scaling BNS chirp mass to 0.9 solar masses
This MR will make all binaries with trigger chirp mass in the range
0.9 < mc < 1.43 use a ROQ scale factor of 1.6, rather than the current
1.3 < mc < 1.43.
This limit was chosen as
0.9 ~= 1.43 / 1.6.
This should allow more low mass triggers to use all the data from 32 Hz, rather than 40 Hz.