fix: Fixed the issue of waiting for restart after exiting

[pengfeixx]

Fixed the issue of waiting for restart after exiting

Bug: https://pms.uniontech.com/bug-view-289903.html
Log: Fixed the issue of waiting for restart after exiting

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在main.qml中新增的GControl.forceExit();调用可能会引发未定义行为，因为GControl对象可能未正确初始化或未定义。
• GlobalControl::forceExit()方法中调用了QApplication::exit(0)和_Exit(0)，这两个函数都会终止应用程序，但_Exit(0)是C标准库函数，可能不适用于所有平台。

是否建议立即修改:

• 是

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: pengfeixx, rb-union

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• debian/deepin/OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment