FIX add prime_tower_skip_points parameter

jira: none
Change-Id: I696d6ca5d9bccf16b48110157cd6ec44839a05e8
(cherry picked from commit 9b5bbebf311c2d8d68ec89aeda3ddae2b267692e)

src/libslic3r/GCode/WipeTower.hpp

@@ -393,6 +393,7 @@ private:
     bool               m_has_tpu_filament{false};
     bool               m_is_multi_extruder{false};
     bool               m_is_print_outer_first{false};
+    bool               m_use_gap_wall{false};
 
 	// G-code generator parameters.
     float           m_cooling_tube_retraction   = 0.f;