fixed "lastexplore" not getting set to "shmup::curtime" when enabling the map editor in shmup

debug.cpp

@@ -168,7 +168,7 @@ vector<cheatkey> cheats = {
   cheatkey{'R'-64, "advance the rose wave", buildRosemap},
   #if CAP_EDIT
   cheatkey{'A', "start the Map Editor", [] {
-    lastexplore = turncount;
+    lastexplore = shmup::on ? shmup::curtime : turncount;
     pushScreen(mapeditor::showMapEditor);
     }},
   cheatkey{'A'-64, "start the Vector Graphics Editor", [] {