fix: move show shortcut panel to mainwindow

[rb-union]

as title.
Enable pop-up shortcut panel on main window.

Log: Fix shortcut issue.
Bug: https://pms.uniontech.com/bug-view-273543.html

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在Shortcut元素中，sequence属性应该是一个字符串数组，而不是一个字符串。
• IV.FileControl.showShortcutPanel函数调用中的参数screenPos.x + parent.Window.width / 2和screenPos.y + parent.Window.height / 2可能会导致坐标计算错误，因为mapToGlobal返回的是一个Point对象，而不是一个坐标值。
• 缺少对Shortcut元素在某些条件下的禁用或启用，可能会导致用户在不适用快捷键的情况下也能看到快捷面板。

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, starhcq

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