Fix running as root

There is no need for TerminalRunner::setRunAsRoot()
as debugger is already being run as root.
Implement runAsRoot for non-terminal QtcProcess, too.

Fixes: QTCREATORBUG-26964
Change-Id: Id5110db86b7b809a5608714464241cee73875f2b
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: hjk <hjk@qt.io>

src/plugins/debugger/terminal.h

@@ -79,7 +79,6 @@ public:
 
     void kickoffProcess();
     void interruptProcess();
-    void setRunAsRoot(bool on);
 
 private:
     void start() final;
@@ -92,7 +91,6 @@ private:
     std::function<ProjectExplorer::Runnable()> m_stubRunnable;
     qint64 m_applicationPid = 0;
     qint64 m_applicationMainThreadId = 0;
-    bool m_runAsRoot = false;
 };
 
 } // namespace Internal