fix(screenshot): disable right-click menu on lock screen

[tianming-1996]

• Set m_isLockedState at startup in checkIsLockScreen() to fix initial value always being false
• Skip right-click menu popup in eventFilter when locked
• Sync lock state to ShapesWidget on creation and DBus changes

修复(screenshot): 禁用锁屏界面下的右键菜单

• 在 checkIsLockScreen() 启动时设置 m_isLockedState，修复初始值始终为 false 的问题
• 在 eventFilter 中锁屏状态下跳过右键菜单弹出
• 在 ShapesWidget 创建及 DBus 状态变化时同步锁屏状态

Log: 修复锁屏界面截图时右键菜单弹出后立即消失的问题
Bug: https://pms.uniontech.com/bug-view-256531.html

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: add-uos, lzwind, tianming-1996

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[tianming-1996]

/merge