games/openttd: update: 15.2 -> 15.3

<ChangeLog>

• Fix: Conditional orders could require a maximum reliability over 100% (#15409)
• Fix: Improve appearance of toolbars and main menu images/text with some non-default base sets (#15402)
• Fix: [Script] IsBuildableRectangle for a 0x0 tile should return false (#15357)
• Fix: Desync caused by train crashes (#15338)
• Fix: Incorrect scroll bar capacity for train details window total cargo tab (#15329)
• Fix #15310: Crash caused by a helicopter running out of fuel near map edge (#15311)

</ChangeLog>

PR: 294594
Approved by: danfe (maintainer)

Sponsored by: tipi.work