community/plasma-desktop: install font-noto-emoji by default

Some kind of emoji font is required to have the emoji picker be usable, and this is the one recommended by upstream.
I'd prefer to put it in some $optional variable but since this is not available, this will have to do
7 jobs for !9880 with community_plasma-desktop-emoji in 5 minutes and 28 seconds
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Status Job ID Name Coverage
  Lint
passed #156810
docker-alpine x86_64
lint

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  Build
passed #156815
docker-alpine ci-build aarch64
build-aarch64

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docker-alpine ci-build armv7
build-armv7

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docker-alpine ci-build ppc64le
build-ppc64le

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docker-alpine ci-build s390x
build-s390x

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docker-alpine ci-build x86
build-x86

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docker-alpine ci-build x86_64
build-x86_64

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