.gitlab/issue_templates/Module_bug.md: add code blocks as a hint for paste

7 jobs for master in 22 minutes and 14 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #28944
build:3

00:02:40

 
  Test
passed #28947
load-modules:3

00:04:59

passed #28945
pyflakes:3

00:05:02

passed #28946
pyflakes-strict:3

00:05:12

passed #28948
unittests:3

00:04:40

43.0%
failed #28949
allowed to fail
unittests-modules:3

00:11:56

42.0%
 
  Deploy
passed #28950
doc:3

00:02:47

 
Name Stage Failure
failed
unittests-modules:3 Test
        </head>
<body>
<h1>Error: 400 Bad Request</h1>
<p>Sorry, the requested URL <tt>'https://ci.weboob.org/api/v1/modules'</tt>
caused an error:</p>
<pre>Invalid JSON payload.</pre>
</body>
</html>
ERROR: Job failed: exit code 1