Debugger: avoid warnings

Remove re-declaration of debug operator for BreakModelId.
Remove also extra `;'.

Change-Id: I2fe9460230b73ab845f4834408e741341f6143de
Reviewed-by: Nikita Baryshnikov <nib952051@gmail.com>
Reviewed-by: hjk <hjk@theqtcompany.com>

src/plugins/debugger/memoryagent.cpp

@@ -303,4 +303,4 @@ quint64 MemoryAgent::readInferiorPointerValue(const unsigned char *data, const P
 
 } // namespace Internal
 } // namespace Debugger
-;
+