Minor followup to r11150.

The regular parsing code not using the same broken logic as parse_comments() is not the same thing as it "ignoring" too high versions, and searching for repetitions of the same token would result in just finding the first one over and over again (the likelihood of this actually mattering to anyone is minuscule, but I needed something to test commit access, and this code has been tested).

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@11167 387891d4-d844-0410-90c0-e4c51a9137d3