refactor(posts): load move thread modal only if canMove is true

solves issue with movelist api returning 400 error when not logged in
however, this change does not solve the underlying issue of trying to
call movelist without credentials

src/views/Posts.vue

@@ -413,7 +413,7 @@
   <posts-delete-modal :selectedPost="selectedPost" :show="showPostsDeleteModal" @close="showPostsDeleteModal = false; selectedPost = null"/>
   <posts-undelete-modal :selectedPost="selectedPost" :show="showPostsUndeleteModal" @close="showPostsUndeleteModal = false; selectedPost = null"/>
   <posts-purge-post-modal :selectedPost="selectedPost" :selectedPostIndex="selectedPostIndex" :page="postData.data.page" :limit="postData.data.limit" :posts="postData.data?.posts" :show="showPostsPurgePostModal" @close="showPostsPurgePostModal = false; selectedPost = null; selectedPostIndex = 0"/>
-  <posts-move-thread-modal :threadId="postData.data.thread?.id" :show="showPostsMoveThreadModal" @close="showPostsMoveThreadModal = false"/>
+  <posts-move-thread-modal v-if="canMove()" :threadId="postData.data.thread?.id" :show="showPostsMoveThreadModal" @close="showPostsMoveThreadModal = false"/>
   <posts-purge-thread-modal :threadId="postData.data.thread?.id" :boardId="postData.data.board?.id" :boardSlug="postData.data.board?.slug" :show="showPostsPurgeThreadModal" @close="showPostsPurgeThreadModal = false"/>
   <posts-report-modal :selectedPost="selectedPost" :canReportPosts="true" :canReportUsers="true" :show="showPostsReportModal" @close="showPostsReportModal = false; selectedPost = null"/>
 </template>