The draw mode (as passed to glDrawArrays) was being compared with the
transform feedback mode in the presence of geometry shaders, but the two
are completely unrelated.

Bug: angleproject:5579
Change-Id: I03bff97f79fe8d8a4354a6ea3abfed58c1e600eb
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2653907
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Tim Van Patten <timvp@google.com>