fix: props definition priority should be script > template

[elevatebart]

A component like this:

<template functional>
  <img :src="props.source" :width="props.width"/>
</template>
<script>
export default {
  props:{
    width: Number
  }
}
</script>

returns width as a string prop...

[vue-styleguidist-bot]

🎉 This PR is included in version 3.3.6 🎉

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