fix: use scss for datemathHelp (#2690)

Co-authored-by: Dominik Pschenitschni <mail@celement.de>
Reviewed-on: #2690
Co-authored-by: Dominik Pschenitschni <dpschen@noreply.kolaente.de>
Co-committed-by: Dominik Pschenitschni <dpschen@noreply.kolaente.de>

src/components/date/datemathHelp.vue

@@ -116,7 +116,7 @@ import BaseButton from '@/components/base/BaseButton.vue'
 const exampleDate = formatDate(new Date(), 'yyyy-MM-dd')
 </script>
 
-<style scoped>
+<style scoped lang="scss">
 .how-it-works-modal {
 	font-size: 1rem;
 }