Fix @Tirokk's suggestions

Wow @Tirokk that was a good catch! I thought that the emitting side
knows the `index`, but no, it only emits `removePostFromList` and that's
it. In order to delete the right post, we have to pass in the `index`
ourselves. So, the caller of the function is the page component itself.

I didn't see the error myself, because in Javascript if you parse
`undefined` or `null` as Integer, you get 0 and it does not raise an
error.

webapp/pages/profile/_id/_slug.vue

@@ -202,11 +202,11 @@
 
           <template v-if="activePosts.length">
             <hc-post-card
-              v-for="post in activePosts"
+              v-for="(post, index) in activePosts"
               :key="post.id"
               :post="post"
               :width="{ base: '100%', md: '100%', xl: '50%' }"
-              @removePostFromList="removePostFromList"
+              @removePostFromList="removePostFromList(index)"
             />
           </template>
           <template v-else-if="$apollo.loading">