fix: theme

Description: 202752 ubuntu系统安装ukui桌面环境，控制面板里点击主题崩溃

Log: 202752 ubuntu系统安装ukui桌面环境，控制面板里点击主题崩溃
Bug: https://172.17.50.104/task-view-202752.html

plugins/personalized/theme/theme.cpp

@@ -393,6 +393,7 @@ void Theme::initIconTheme() {
     }
 
     connect(mThemeIconBtnGroup, SIGNAL(buttonClicked(QAbstractButton*)), this, SLOT(iconThemeBtnClickSlot(QAbstractButton*)));
+
     ui->iconverLyt->setContentsMargins(0, 16, 0, 0);
     ui->iconverLyt->addWidget(mThemeIconLabel);
     ui->iconverLyt->addWidget(mThemeIconFrame);
@@ -1033,6 +1034,7 @@ bool Theme::isUpgrade()
     version_t ver= kdk_system_get_version_detaile();
     QString version = QString(ver.update_version);
     mIsUpgrade = (version != "2303");
+    return mIsUpgrade;
 }