Makes throw_immune actually useful

Believe it or not, is_throw_immune wasn't actually checked anywhere in
the code.  Time to fix that!
Anti-Vortex

Currently it's the only "throw" attack against the player, so Judo
immunity applied.   Fixes potential bug in the dodge/tentacle code too.
Merge pull request #7155 from KA101/judofix

Judo fix