Debugger: Use USVC extra data more directly

Not nicer, but more similar to the rest of extra data, so one
approach less.

Change-Id: I2c9a3a041ab3f017f3350c0399d57feeb422048c
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/debugger/debuggerruncontrol.h

@@ -131,6 +131,8 @@ public:
     Internal::TerminalRunner *terminalRunner() const;
     DebuggerEngineType cppEngineType() const;
 
+    Internal::DebuggerRunParameters &runParameters() { return m_runParameters; }
+
 private:
     bool fixupParameters();
     void handleEngineStarted(Internal::DebuggerEngine *engine);