Don't add local suffix (one space character) for field completions

Correctly deal with private local fields backing up a val/var. The
presentation compiler always returns the `val` backing up a val/var, for
reasons of uniformity (getters won't work everywhere, because local variables
or private fields don't have a getter). However, the
proper way to look at such fields is to look for their getter (who
has the correct name, accessibility flags, etc).

Fixes #1001973
Merge pull request #610 from dragos/issue/flaky-completion-relevance-test-1001973

Don't add local suffix (one space character) for field completions