x86/emul: Drop more redundant ctxt.event_pending checks

x86/emul: Drop more redundant ctxt.event_pending checks

Since c/s 92cf67888a, x86_emulate_wrapper() asserts stricter behaviour about
the relationship between X86EMUL_EXCEPTION and ctxt.event_pending.

These removals should have been included in the aforementioned changeset, and
were only omitted due an oversight.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Paul Durrant <paul.durrant@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Acked-by: Tim Deegan <tim@xen.org>
Release-acked-by: Julien Grall <julien.grall@arm.com>