go/printer: check whether !isTypeElem, instead of combinesWithName when ParenExpr
See discussion in CL 610115 and CL 610758.
For #69206
Change-Id: I16f394cb3440106650fb64a466f2723a4dba3871
GitHub-Last-Rev:
37993b5baf11f83e8fb9428981965f2d964cddf3
GitHub-Pull-Request: golang/go#69309
Reviewed-on: https://go-review.googlesource.com/c/go/+/611355
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>