chg: v3bwfile: Stop scaling with consensus weight

because when the observed bandwidth is higher than the consensus (for
example when the relay is new or was some time down), it's limited by
the previous consensus, not allowing it to grow.

Since the size of the data to download depends also on the consensus
weight, this results on lower measured bandwidth too.

Closes #40091.
11 jobs for m12_issue40091_low_weight_01 in 33 minutes and 53 seconds (queued for 15 minutes and 10 seconds)
Status Name Job ID Coverage
  Test
passed python310 #24661

00:13:11

passed python36 #24653

00:12:39

passed python37tor035 #24654

00:12:37

passed python37tor045 #24655

00:12:27

passed python37tor046 #24656

00:12:25

passed python37tormaster #24657

00:12:30

passed python37torstable #24658

00:12:35

passed python38 #24659

00:06:57

passed python39 #24660

00:13:58

 
  Deploy
passed pages #24662

00:00:59

passed pages:deploy

00:00:00