fix(FileList): reset file page cursor on branch change (#1497)

Co-authored-by: niuran <1287936158@qq.com>

Author: zhendi

frontend/src/components/shared/FileList.vue

@@ -267,6 +267,8 @@
     currentBranch.value = branch
     currentPath.value = ''
     
+    filePageCursor.value = ''
+
     setRepoTab({
       currentBranch: branch,
       actionName: 'files',