fix: setAutostart接口优化

非法desktop文件或者非本地应用，直接返回false

Log:
Influence: setAutostart接口功能正常
Task: https://pms.uniontech.com/task-view-215413.html
Change-Id: Idec45c8c314e1a0bd3db93e8a1d85c3cab634905

src/modules/startmanager/startmanager.cpp

@@ -251,6 +251,11 @@ void StartManager::onAutoStartupPathChange(const QString &path)
 
 bool StartManager::setAutostart(const QString &desktop, const bool value)
 {
+    if (!desktop.endsWith(".desktop")) {
+        qWarning() << "invalid desktop item...";
+        return false;
+    }
+
     QString desktopFullPath = desktop;
     QFileInfo info(desktopFullPath);
     if (!info.isAbsolute()) {
@@ -270,6 +275,12 @@ bool StartManager::setAutostart(const QString &desktop, const bool value)
         }
     }
 
+    // 本地没有找到该应用就直接返回
+    if (!info.isAbsolute()) {
+        qWarning() << "invalid item...";
+        return false;
+    }
+
     QDir autostartDir(BaseDir::userAutoStartDir().c_str());
     const QString &appId = info.baseName();