[2.6] can_unit_do_activity_targeted_at() unknown activity 120

[lmoureaux]

Server logs for LT53:

1: can_unit_do_activity_targeted_at() unknown activity 120
2: Backtrace:
2:     0: /home/dude/server/MP3_26/freeciv-server(backtrace_print+0x29) [0x558eb9640d29]
2:     1: /home/dude/server/MP3_26/freeciv-server(vdo_log+0x84) [0x558eb9644824]
2:     2: /home/dude/server/MP3_26/freeciv-server(do_log+0x93) [0x558eb96448d3]
2:     3: /home/dude/server/MP3_26/freeciv-server(can_unit_do_activity_targeted_at+0x64d) [0x558eb96385fd]
2:     4: /home/dude/server/MP3_26/freeciv-server(settler_evaluate_city_requests+0x18d) [0x558eb94471cd]
2:     5: /home/dude/server/MP3_26/freeciv-server(auto_settler_findwork+0xde) [0x558eb94488de]
2:     6: /home/dude/server/MP3_26/freeciv-server(auto_settler_setup_work+0x164) [0x558eb9448d54]
2:     7: /home/dude/server/MP3_26/freeciv-server(auto_settler_findwork+0x25c) [0x558eb9448a5c]
2:     8: /home/dude/server/MP3_26/freeciv-server(auto_settlers_player+0x695) [0x558eb944a6f5]
2:     9: /home/dude/server/MP3_26/freeciv-server(srv_main+0xcd8) [0x558eb941efc8]
2:    10: /home/dude/server/MP3_26/freeciv-server(main+0x355) [0x558eb94140e5]
2:    11: /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xeb) [0x7f185488809b]
2:    12: /home/dude/server/MP3_26/freeciv-server(_start+0x2a) [0x558eb9414d7a]