SaveTool: make the tuning tab present only in debug builds.

src/SaveTool/SaveTool_MassViewer.cpp

@@ -138,10 +138,12 @@ void SaveTool::drawMassViewer() {
                     ImGui::EndTabItem();
                 }
 
+                #ifdef SAVETOOL_DEBUG_BUILD
                 if(ImGui::BeginTabItem("Tuning (WIP)")) {
                     drawTuning();
                     ImGui::EndTabItem();
                 }
+                #endif
 
                 ImGui::EndTabBar();
             }