[1.3.9] COOP Squad leader accept bug

Desciption

When I join a squad full of bots in COOP Local I get the question if I want to become the squad leader. When I press page up to accept, it ignores it. The message will go away but I do not become the SL.

Steps to reproduce

1) Start up a local coop server and join a bot squad.
2) Now accept the squad leader invitation.

Tested on Albashra 32 and on Khamisiyah 128. PR 1.3.9, LOCAL, 96 bots