shell/keychain: remove deprecated 'agent-parameter

Author: Stunkymonkey

shell/keychain.sh

@@ -2,6 +2,6 @@
 
 # Assert an ssh-agent (which is empty at the beginning)
 if command -v keychain > /dev/null 2>&1; then
-	eval "$(keychain -q --nogui --agents ssh --timeout 600 --eval)"
+	eval "$(keychain -q --nogui --timeout 600 --eval)"
 fi