rules: fix check for appending '|' character when applying There are two ways to separate multiple files in XKB include statements: '+' will cause the later file to override the first in case of conflict, while '|' will cause it augment it (this is done by xkbcomp). '!' is unrelated here. Since '|' is practically never used, this wasn't noticed. In the modified test, the '|some_compat' previously was just ignored. Signed-off-by: Ran Benita <ran234@gmail.com>