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
x86_64 docker-alpine
lint

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  Build
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aarch64 ci-build docker-alpine
build-aarch64

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armv7 ci-build docker-alpine
build-armv7

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ppc64le ci-build docker-alpine
build-ppc64le

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s390x ci-build docker-alpine
build-s390x

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x86 ci-build docker-alpine
build-x86

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x86_64 ci-build docker-alpine
build-x86_64

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