Fix/workaround T51070: Cannot scale procedural texture in compositor

The issue is coming from some weird semi-finished canvas feature, which
was remapping coordinate without applying any differential on the sampling
ellipse (in fact, there is no ellipse, sampling think is always a single
pixel).

The whole thing is just weak in the compositor, for now just bring behavior
back to how it was prior to optimization (multithreading) commit.

source/blender/compositor/operations/COM_TextureOperation.cpp

@@ -41,6 +41,7 @@ TextureBaseOperation::TextureBaseOperation() : NodeOperation()
 	this->m_rd = NULL;
 	this->m_pool = NULL;
 	this->m_sceneColorManage = false;
+	setComplex(true);
 }
 TextureOperation::TextureOperation() : TextureBaseOperation()
 {