GL: Use the executable instead of program In a few places, the program was still being directly referenced instead of the executable (in particular when dealing with multiview). Bug: angleproject:8297 Change-Id: I15d0865bf58376a9f85efeec739dd93b49ceaea7 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4846475 Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>