Fix bug #21759

Removed duplicate code that caused timer to be refreshed an additional
time if time runs out. The usual refreshing in
playmp_controller::after_human_turn is already called in this case as
well (after turn ends). The duplicate code gave the bonuses before the
turn ended, and after that the turn was ended (giving turn bonus again)
only if there was no random seed incoming from the server.
Merge branch 'fixbug21759the2nd' of https://github.com/Duthlet/wesnoth into 1.12

Conflicts:
	changelog