ENH: generate framework for all layers

jira: none
Change-Id: I95f35ba45fe9f544c53bdf0c5a52a70bd45ee7a9
(cherry picked from commit 3e0b6eb2289eab383c6e616d37559b0c6619eca1)

src/libslic3r/GCode/WipeTower.hpp

@@ -435,6 +435,7 @@ private:
     float              m_extra_rib_length=0.f;
     bool               m_used_fillet{false};
     Vec2f              m_rib_offset{Vec2f(0.f, 0.f)};
+    bool               m_tower_framework{false};
 
 	// G-code generator parameters.
     float           m_cooling_tube_retraction   = 0.f;