Ozone's EGL windows are emulated, so we can always create one,
thus setting EGL_WINDOW_BIT in all configs is safe.

This is now required because in http://crrev.com/c/2378922
EGL_WINDOW_BIT becomes a requirement to be able to run tests.

Previously Ozone's configs copied native EGL_SURFACE_TYPE,
which was either 0 or having just EGL_PBUFFER_BIT.

Bug: chromium:1181952, chromium:1034840
Change-Id: Ic2b14b43b3c32b47ea05d9d8da9fba7439f14d19
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2725273Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>