fix: incorrect bluetooth device icon theme type

[ArchieMeng]

Bug: https://pms.uniontech.com/bug-view-271571.html
Log: incorrect bluetooth device icon theme type

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ArchieMeng, xionglinlin

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[deepin-bot]

TAG Bot

New tag: 6.0.66
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #1715

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在BluetoothDeviceModel::data函数中，新增代码逻辑可能存在逻辑错误，isDarkTheme变量在case Qt::DecorationRole中被重新赋值，可能导致原有逻辑失效。
• BluetoothDeviceModel::getBatteryIcon函数中，iconNameSystem的计算逻辑与isDarkTheme变量有关，但注释中提到"-dark"与暗主题无关，这可能与代码逻辑不一致。
• 新增代码中没有对themeType的值进行有效性检查，可能会导致未处理的初始化错误。

是否建议立即修改:

• 是

[ArchieMeng]

/forcemerge

[deepin-bot]

This pr force merged! (status: blocked)