Point default bug report URL at Morello LLVM rather than CHERI LLVM

Whilst many bugs could be generic CHERI bugs rather than be specific to
Morello, we don't want to be the first point of contact for bugs arising
from using Morello LLVM.
7 jobs for !128 with bug-report-url in 171 minutes and 2 seconds (queued for 4 seconds)
latest detached
Status Job ID Name Coverage
  Build Stage1
passed #50788
build-toolchain

01:49:48

 
  Build Stage2
passed #50789
build-android

00:59:07

passed #50790
build-busybox

00:07:50

passed #50791
build-firmware

00:07:05

 
  Generate Test
passed #50792
generate-test

00:02:06

 
  Test
passed test

passed #50794
arm64
test-busybox

00:02:53