CAD: an armed face/edge pick must not lose its click to the body escalation

A card that asks for a face ("Click a solid FACE in the viewport") could not be
satisfied. Clicking the same sub-element twice deliberately escalates to the
whole body — right for free picking, wrong here: the user clicks the very face
the card is pointing at, the escalation turns it into a whole-body pick, and the
armed capture rejects it and leaves "(none)". Both orders failed, so a
face-based Coord Sys was reachable only by accident of ordering. That mattered
beyond the card: a mate needs a connector with an owning body, and a face or
edge pick is the only thing that sets one.

Adds DesignSketchTool::set_escalate_on_repick, off while the Plane, Axis or
CoordSys card has a pick armed and back on as soon as it is captured or
abandoned. While armed, clicking a face means "this face", which is what the
prompt already says.

Verified on the rig: arm Pick Face, click the face, and it reads "#5" on the
first click. With nothing armed the escalation still alternates whole <-> face
as before.

src/slic3r/GUI/DesignSketchTool.cpp

@@ -3159,7 +3159,7 @@ bool DesignSketchTool::handle_solid_click(GLCanvas3D& canvas, const wxMouseEvent
           : m_solid_sel == SolidSel::Edge   ? m_sel_edge == prev_edge
           : m_solid_sel == SolidSel::Face   ? m_sel_face == prev_face
                                             : true);
-    if (same_pick) {
+    if (same_pick && m_escalate_repick) {
         select_body(m_sel_body);   // clears face/edge/vertex, tints the whole body
         dp_pick_trace("re-pick -> escalated to whole body %d", m_sel_body);
     }