`tic80 foo.tic` followed by `save` saves to the wrong place

[ToxicFrog]

• put a TIC-80 ROM somewhere that isn't ~/.local/share/com.nesbox.tic/TIC-80/, say, /tmp/test.tic
• load it from the command line using tic80 /tmp/test.tic or cd /tmp && tic80 test.tic
• save the ROM with save or ctrl-S
• observe that the original ROM is untouched and there is now a copy in ~/.local/share/com.nesbox.tic/TIC-80/