qcacmn: Change best candidate weight from 100 to 200

With new scoring parameters, host calculates candidate
scores equal to the best candidate score, and connects
with best candidate, without considering the bssid hint
from userspace.

Increase the max limit of the best candidate from 10000
to 20000, to keep score of preferred candidate at the top

Change-Id: Ia2da3821b4b13dd741e9b778c80d000cb512fd63
CRs-Fixed: 3084042