Move PASS/FAIL to the end of file name

[atomczak]

This is rather cosmetic, but it would be better to read and work with the test files if the PASS/FAIL/INVALID information was at the end of the file name. This way, we would have a pass/fail files next to each other when sorting alphabetically.

Example:
NOW: pass-nesting_may_be_indirect.ifc
PROPOSAL: nesting_may_be_indirect-pass.ifc