Don't wait for background tasks before closing the project manager frame.

Cancels the curl transfer if the reporter was cancelled.

common/background_jobs_monitor.cpp

@@ -183,7 +183,7 @@ BACKGROUND_JOB_REPORTER::BACKGROUND_JOB_REPORTER( BACKGROUND_JOBS_MONITOR* aMoni
 
 bool BACKGROUND_JOB_REPORTER::updateUI()
 {
-    return true;
+    return !m_cancelled;
 }