Fix three coverity issues

Reported here: https://mail.kde.org/pipermail/konsole-devel/2022-July/041429.html

• Use delete[] to free array allocated with new.
• Don't separate two cases which are handled identically.
• In vt100 parsing state machine no need to handle in specific states characters which are handles identically in all states.

This should probably be applied to 22.08 as well.