ProcessInterface: Drop arguments from finished() signal

Make the API more similar to QtcProcess API.

Change-Id: If62051908b7974008bebda21dd288b02e7a772f3
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/qtcprocess.h

@@ -309,7 +309,7 @@ public:
 
 signals:
     void started();
-    void finished(int exitCode, QProcess::ExitStatus status);
+    void finished();
     void errorOccurred(QProcess::ProcessError error);
     void readyReadStandardOutput();
     void readyReadStandardError();