AutoTest: Connect to done() signal instead of finished()

QtcProcess::done() is also emitted when process failed to start.

Change-Id: I08f6f104014d1c90c0f761de352dada620207d86
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/autotest/testrunner.h

@@ -90,7 +90,7 @@ private:
     void setUpProcessEnv();
     void scheduleNext();
     void cancelCurrent(CancelReason reason);
-    void onProcessFinished();
+    void onProcessDone();
     void resetInternalPointers();
 
     void runTests();