Displaying plugins formats output differently for core20 v core22

[Robert P. J. Day]

Curious newline difference when displaying plugins for different bases:

$ snapcraft plugins --base core18
Displaying plugins available for 'core18'
ant cmake dotnet godeps make nodejs ruby
autotools colcon dump gradle maven plainbox-provider rust
catkin conda flutter kbuild meson python scons
catkin-tools crystal go kernel nil qmake waf
$

$ snapcraft plugins --base core20
Displaying plugins available for 'core20'
autotools catkin-tools colcon crystal go meson npm qmake
catkin cmake conda dump make nil python rust
$

$ snapcraft plugins --base core22
Displaying plugins available for 'core22'
autotools
cmake
dotnet
dump
go
meson
make
nil
npm
python
rust
colcon
conda
$

$ snapcraft version
snapcraft 7.1.4.post46+git370c0327
$