Use (bigger) v-textarea for imputting comments when amending lessons

aleksis/apps/chronos/frontend/components/calendar_feeds/details/LessonDetails.vue

@@ -154,6 +154,12 @@
               v-on="on"
             />
           </template>
+          <template #comment.field="{ attrs, on }">
+            <v-textarea
+              v-bind="attrs"
+              v-on="on"
+            />
+          </template>
         </dialog-object-form>
       </v-card-actions>
     </template>