Fix `require` typo to `required`

app/assets/javascripts/sidebar/components/assignees/assignee_avatar.vue

@@ -13,7 +13,7 @@ export default {
     },
     issuableType: {
       type: String,
-      require: true,
+      required: false,
       default: 'issue',
     },
   },

app/assets/javascripts/sidebar/components/assignees/assignees.vue

@@ -25,7 +25,7 @@ export default {
     },
     issuableType: {
       type: String,
-      require: true,
+      required: false,
       default: 'issue',
     },
   },

app/assets/javascripts/sidebar/components/assignees/collapsed_assignee.vue

@@ -12,7 +12,7 @@ export default {
     },
     issuableType: {
       type: String,
-      require: true,
+      required: false,
       default: 'issue',
     },
   },

app/assets/javascripts/sidebar/components/assignees/collapsed_assignee_list.vue

@@ -20,7 +20,7 @@ export default {
     },
     issuableType: {
       type: String,
-      require: true,
+      required: false,
       default: 'issue',
     },
   },

app/assets/javascripts/sidebar/components/assignees/sidebar_assignees.vue

@@ -29,7 +29,7 @@ export default {
     },
     issuableType: {
       type: String,
-      require: true,
+      required: false,
       default: 'issue',
     },
   },

app/assets/javascripts/sidebar/components/assignees/uncollapsed_assignee_list.vue

@@ -19,7 +19,7 @@ export default {
     },
     issuableType: {
       type: String,
-      require: true,
+      required: false,
       default: 'issue',
     },
   },