Fix -skipsec and -skiptic not working with -warp

[Pedro-Beirao]

Summary

Fixes 2 issues reported on discord, that were introduced in #875

I'm also noticing something else related to -recordfromto. In 0.29.4, if I used it in combination with -warp and -skipsec, the game would first process the -warp to get to the specified map, then add the -skipsec to get to the level time I'd specified. However, it now seems to be ignoring the -skipsec.

not sure if its been reported yet but when playing back demos in v30.0 the demo starts at the end screen, instead of at the beginning of the demo

This solution takes into account how many tics since the start of the level.

Patch notes

• Fixed -skipsec and -skiptic not working with -warp
• Fixed -warp during demos skipping incorrectly