remove jdk.test.lib.FileInstaller action from compiler/c2/stemmer test

`compiler/c2/stemmer` test uses `jdk.test.lib.FileInstaller` to copy "words" file from the test source directory to the current working directory, `compiler.c2.stemmer.Stemmer` can read this file. yet, `c.c.s.Stemmer` class treats its 1st argument as a path to the file, given this isn't needed and we can pass "${test.src}/words" instead of "words"