Fix #4172: Expose ride-type changing capability in UI

This also allows changing ride type in multiplayer games. Very crashy.

src/rct2/S6Exporter.cpp

@@ -565,6 +565,7 @@ extern "C"
         SDL_WriteU8(rw, gCheatsNeverendingMarketing);
         SDL_WriteU8(rw, gCheatsFreezeClimate);
         SDL_WriteU8(rw, gCheatsDisablePlantAging);
+        SDL_WriteU8(rw, gCheatsAllowArbitraryRideTypeChanges);
 
         gfx_invalidate_screen();
         return 1;