Fix MemoryViewWidget background colour

Source/Core/DolphinQt/Debugger/MemoryViewWidget.cpp

@@ -549,7 +549,7 @@ void MemoryViewWidget::UpdateBreakpointTags()
       }
       else
       {
-        cell->setBackground(Qt::white);
+        cell->setBackground(Qt::transparent);
       }
     }