effects/mousemark: Specify effect chain position

BUG: 457639

src/effects/mousemark/mousemark.cpp

@@ -226,4 +226,9 @@ bool MouseMarkEffect::isActive() const
     return (!marks.isEmpty() || !drawing.isEmpty()) && !effects->isScreenLocked();
 }
 
+int MouseMarkEffect::requestedEffectChainPosition() const
+{
+    return 10;
+}
+
 } // namespace

src/effects/mousemark/mousemark.h

@@ -28,6 +28,7 @@ public:
     void reconfigure(ReconfigureFlags) override;
     void paintScreen(int mask, const QRegion &region, ScreenPaintData &data) override;
     bool isActive() const override;
+    int requestedEffectChainPosition() const override;
 
     // for properties
     int configuredWidth() const