network: equal spacing between list sections

There should be an equal amount of vertical space between each list
section.

Fixes #550
11 jobs for 550-uneven-section-spacing-in-network-panel in 3 minutes and 36 seconds (queued for 2 seconds)
latest
Status Name Job ID Coverage
  Build
passed build #326124

00:02:14

 
  Test
passed asan #326126

00:01:19

passed test #326125

00:01:21

 
  Manual
manual armv8 #326131
allowed to fail manual
manual flatpak #326127
allowed to fail manual
manual msan #326130
allowed to fail manual
manual ppc64le #326132
allowed to fail manual
manual tsan #326128
allowed to fail manual
manual ubsan #326129
allowed to fail manual
 
  Review
manual review #326133
allowed to fail manual
manual stop_review #326134
allowed to fail manual