configs/common/busybox: disable BUSYBOX_DEFAULT_INSTALL_NO_USR

In OpenWrt's defaults, this is disabled by default. Some scripts in our
distribution currently fails, because it could not find env.

Example:
/usr/bin/env is missing and it is very bad, because this is standard
path, where you expect env.

Because of this option, we can see that env is located in /bin, which is
wrong. We need this option in the past as we moved everything related to
busybox to /{s,}bin

More details about this option:
https://github.com/openwrt/openwrt/blob/bbff6239e2ea273388f4ca0f8586945ff5f36271/package/utils/busybox/config/Config.in#L195
8 jobs for majorfix/busybox-remove-usr in 11 minutes and 19 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Build
passed #521663
lists_generate

00:01:03

passed #521660
medkit_mox

00:11:18

passed #521661
medkit_omnia

00:10:34

failed #521662
medkit_turris1x

00:01:27

passed #521657
prepare_mox

00:04:03

passed #521658
prepare_omnia

00:04:37

passed #521659
prepare_turris1x

00:04:17

 
  Verify
passed #521664
lists_verify

00:02:40

 
Name Stage Failure
failed
medkit_turris1x Build
INFO:Target Turris OS: 6.0
ERROR:
inconsistent: Requested package uboot-envtools that is not available.
line not found
line not found
line not found
line not found
line not found
ERROR: Job failed: exit code 1