NetworkPkg/HttpBootDxe: Avoid to corrupt HttpBootDxe setup screen.

NetworkPkg/HttpBootDxe: Avoid to corrupt HttpBootDxe setup screen.

When giving an invalid URI in Boot URI field within HTTP Boot
configuration page, the AsciiPrint will corrupt the setup screen.

This patch is to resolve the issue.

Cc: Fu Siyuan <siyuan.fu@intel.com>
Cc: Ye Ting <ting.ye@intel.com>
Cc: Jiaxin Wu <jiaxin.wu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Karunakar P <karunakarp@amiindia.co.in>
Reviewed-by: Jiaxin Wu <jiaxin.wu@intel.com>