gpu_display: fix Linux keycode for '`'.
gpu_display: fix Linux keycode for '`'.

BUG=b:213150276
TEST=presubmit

Change-Id: I92fad55467b1f740ec94cf1575573d47141b7c76
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/3871958
Commit-Queue: Pujun Lun <44f73f20486fefa5f75e126d2918ae0dbc923dd5@google.com>
Reviewed-by: Daniel Verkamp <72bc170b46ec491f7bdd4359a1c0bfed274de40c@chromium.org>
Tested-by: Pujun Lun <44f73f20486fefa5f75e126d2918ae0dbc923dd5@google.com>

google/crosvm,google/crosvm,google/crosvm,google/crosvm