Replaced whitespace in several icon names with a hyphen.

[ghost]

apps/scalable/{Mini Diary.svg => Mini-Diary.svg} apps/scalable/{NONONSENSE FORUM.svg => NONONSENSE-FORUM.svg} apps/scalable/{SPEED TEST.svg => SPEED-TEST.svg} apps/scalable/{lufi disroot.svg => lufi-disroot.svg} apps/scalable/{lufi ethibox.svg => lufi-ethibox.svg} apps/scalable/{lufi infini.svg => lufi-infini.svg} apps/scalable/{nixnet etherpad.svg => nixnet-etherpad.svg} apps/scalable/{nixnet polr.svg => nixnet-polr.svg} apps/scalable/{rss bridge.svg => rss-bridge.svg} apps/scalable/{tronland webapp icons.svg => tronland-webapp-icons.svg}