OvmfPkg/QemuVideoDxe: fix bochs mode init

Gerd Hoffmannrequested to merge
(removed):RHELX-58-stdvga-blank-fix into c9s

Summary of Changes

cherry-picked stdvga bugfix

Approved Bugzilla Ticket

Jira: https://issues.redhat.com/browse/RHELX-58

Edited by Miroslav Rezanina

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