Storyboard.vue: remove css with no applications

The css violates vue-scoped-css/require-v-deep-argument
which will be more strictly enforced by vue3.

I changed all the values to 10'000, and it had no effect.
Because there was no explanation why this is here
in the commit message, in the PR or in the comments,
i delete this css.

Was introduced in:
PR: #3224
Commit: 9060a33

frontend/src/components/activity/content/Storyboard.vue

@@ -172,12 +172,4 @@ export default {
 </script>
 
 <style scoped lang="scss">
-:deep {
-  .v-text-field.v-text-field--enclosed.v-text-field--outlined:not(.v-input--dense)
-    .editor {
-    margin-top: 10px;
-    padding-top: 5px;
-    margin-bottom: 10px;
-  }
-}
 </style>