SW: drop tshark + wireshark from GRML_FULL

libwireshark15 has >100MB Installed-Size, and wireshark plus all its
dependencies currently require 164MB of disk space on grml-full. This
seems to be too much for one specific, non-essential tool, and given we
still ship tcpdump, it makes more sense to reduce ISO size.

tshark depends on wireshark-common, so we need to also drop it.

Related to #118

etc/grml/fai/config/package_config/GRML_FULL

@@ -200,14 +200,12 @@ tcpdump
 tcptraceroute
 telnet
 tmate
-tshark
 tsocks
 uml-utilities
 usb-modeswitch
 vlan
 wireguard
 wireless-regdb
-wireshark
 
 # network transfers
 ca-certificates