Svelte file being listed as a dependency of itself

[kaisermann]

Reported by @dominikg:

The following component:

<script lang="ts" src="./MultiFile.ts"></script>
<template lang="html" src="./MultiFile.html"></template>
<style lang="scss" src="./MultiFile.scss"></style>

Returns the following deps:

0 = "/home/dominikg/develop/sveltejs/vite-plugin-svelte/packages/playground/svelte-preprocess/src/lib/multifile/MultiFile.html"
1 = "/home/dominikg/develop/sveltejs/vite-plugin-svelte/packages/playground/svelte-preprocess/src/lib/multifile/MultiFile.ts"
2 = "/home/dominikg/develop/sveltejs/vite-plugin-svelte/packages/playground/svelte-preprocess/src/lib/multifile/MultiFile.scss"
3 = "/home/dominikg/develop/sveltejs/vite-plugin-svelte/packages/playground/svelte-preprocess/src/lib/multifile/MultiFile.svelte"
4 = "/home/dominikg/develop/sveltejs/vite-plugin-svelte/packages/playground/svelte-preprocess/src/lib/multifile/_someImport.scss"
length = 5

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After some research, I found that the scss transformer is the one returning the parent svelte file as a dependency. This can be easily fixed by filtering it out before returning the processed result. If another transformer shows this behaviour, we can move that logic upwards.