end2end: Remove reference to *_EGL configs from help message The *_EGL configs were removed with the following CL: Support running the full end2end suite against the System EGL https://crrev.com/c/6580876 Instead, users need to use the GN arg: angle_test_enable_system_egl = true Update the help message to remove the reference to *_EGL configs and point users to the GN arg instead. Bug: b/279980674 Change-Id: I05908a65eaab6d6a9fbdca9039b687ce4fc31567 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6696787 Reviewed-by: mohan maiya <m.maiya@samsung.com> Commit-Queue: Tim Van Patten <timvp@google.com>