adapt

mluq/tests/TestMain.cpp

@@ -26,7 +26,7 @@ protected:
 
   void TearDown() override {
     delete mainProgram;
-    Plotting::InstanceM().Clear();
+    Plotting::Instance().Clear();
     Config::close();
   }
 };

mluq/tests/pdesolvers/TestPDESolver.hpp

@@ -64,7 +64,7 @@ protected:
 
   void TearDown() override {
     PPM->Barrier(0);
-    Plotting::InstanceM().Clear();
+    Plotting::Instance().Clear();
   }
 };