snap/snapcraft.yml: rm ttf-ubuntu-font-family pkg #2607

Job	Run time
linux20-github--dotnet-and-mono	4m 32s
linux20-github--dotnet-and-newmono	4m 6s
linux20-vanilla--newmono-only	10m 43s
linux20-vanilla--stockmono-only	7m 5s
linux22-github--dotnet-and-mono	5m 23s
linux22-github--dotnet-and-newmono	5m 2s
linux22-vanilla--newmono-only	12m 9s
linux22-vanilla--stockdotnet6-and-newmono	7m 25s
linux22-vanilla--stockdotnet6-and-stockmono	5m 35s
linux22-vanilla--stockdotnet6-only	6m 38s
linux22-vanilla--stockmono-only	7m 17s
macOS--dotnet6-and-mono	6m 45s
macOS--dotnet6-only	4m 59s
windows--dotnet6-and-legacyFramework	7m 31s
macOS--mono-only	17m 42s
windows--dotnet6-only	9m 49s
windows--legacyFramework-only	15m 38s
conventions	7s
snap_pkg	0s
	2h 18m 26s

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