Fix typo in logging

[lmagyar]

This is how all other FileSystemView writes out the trace info.

[wolpi]

I like the old code more because:

• I prefer to not change passed in parameters (I could mark all of them final, nearly everywhere)
• With variable name abs i wanted to point out that the absolute path is used
• In log output the original parameter is logged which I find helpful to understand what is going on

In (some of) other impls both paths are logged (the passed in one and the absolute one). E.g. in SAF (here it overrides the paramter which I often avoid):

        logger.trace("getFile({})", file);

        file = absolute(file);
        logger.trace("  getFile(abs: {})", file);

and Virtual:

        String absoluteVirtualPath = absolute(file);
        logger.debug("getFile '{}', absolute: '{}'", file, absoluteVirtualPath);

[lmagyar]

I agree, reverted. But the old code has a bug, it logs file instead of abs, so I fixed that.

And made a separate commit (can be reverted if you don't like it), where I changed all other getFile implementations to not change passed in file parameter, but use a new String abs.

[wolpi]

Nice to clean that up