Update sync_data.sh

sync_data.sh

@@ -112,7 +112,7 @@ if len(backups) > 5:
 else:
     print('Only {} backups found, no need to clean.'.format(len(backups)))
 " 2>&1
-            else
+            else:
                 echo "Failed to upload ${backup_file} to WebDAV"
             fi
 
@@ -127,7 +127,7 @@ else:
     done
 }
 
-# 启动同步进程。
+# 启动同步进程
 sync_data &
 
 # 启动 Cloudreve