Workbench: Fix Wrong AntiAliasing in renders

Was caused by offseting the same matrix for each samples instead of adding
the offset to the original projection matrix.

source/blender/draw/engines/workbench/workbench_render.c

@@ -155,6 +155,8 @@ void workbench_render(WORKBENCH_Data *data, RenderEngine *engine, RenderLayer *r
 			if (RE_engine_test_break(engine)) {
 				break;
 			}
+			/* TODO: Save matrices instead of recomputing them for each samples. */
+			workbench_render_matrices_init(engine, depsgraph);
 
 			workbench_deferred_draw_background(data);
 			workbench_deferred_draw_scene(data);