chore: update dde-file-manager-daemon service dependencies

Changed the service dependencies from dde-session-pre.target to dde-
session-core.target
This ensures the file manager daemon starts after the core session
services are ready
The change aligns with the updated session initialization sequence

Influence:
1. Verify dde-file-manager-daemon starts after dde-session-core.target
2. Check that file manager functionality works correctly with new
dependency order
3. Test session startup sequence and service initialization timing
4. Confirm no regressions in file management operations

chore: 更新 dde-file-manager-daemon 服务依赖项

将服务依赖从 dde-session-pre.target 更改为 dde-session-core.target
确保文件管理器守护进程在核心会话服务准备就绪后启动
此更改与更新的会话初始化顺序保持一致

Influence:
1. 验证 dde-file-manager-daemon 在 dde-session-core.target 之后启动
2. 检查文件管理器功能在新的依赖顺序下正常工作
3. 测试会话启动顺序和服务初始化时序
4. 确认文件管理操作没有回归问题

Author: Johnson-zs

src/apps/dde-file-manager-daemon/dbusservice/dde-file-manager.service

@@ -1,10 +1,9 @@
 [Unit]
 Description=DDE File Manager Daemon
 
-Wants=dde-session-pre.target
-After=dde-session-pre.target
+Wants=dde-session-core.target
+After=dde-session-core.target
 
-Wants=dde-session-initialized.target
 PartOf=dde-session-initialized.target
 Before=dde-session-initialized.target