4625: Use ETextAlignment enum for UI r=def- a=ChillerDragon
Replaces the magic numbers -1/0/1 for left/center/right
Based on the work done in upstream:
`@cinaera` added alignment enums
04ee8b20a1
`@TsFreddie` renamed them
67651e8122
## Checklist
- [x] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test if it works standalone, system.c especially
- [ ] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)
Co-authored-by: ChillerDragon <ChillerDragon@gmail.com>
390e54f627