mailmap: correct name for a historical account of Zijun Hu

Correct the name for <zijun_hu@htc.com> from 'zijun_hu' to 'Zijun Hu'.

Link: https://lkml.kernel.org/r/20250620-my_mailmap-v1-2-11ea3db8ba1e@oss.qualcomm.com
Signed-off-by: Zijun Hu <zijun.hu@oss.qualcomm.com>
Cc: Hans verkuil <hverkuil@xs4all.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: zijun-hu

.mailmap

@@ -832,3 +832,4 @@ Zack Rusin <zack.rusin@broadcom.com> <zackr@vmware.com>
 Zhu Yanjun <zyjzyj2000@gmail.com> <yanjunz@nvidia.com>
 Zijun Hu <zijun.hu@oss.qualcomm.com> <quic_zijuhu@quicinc.com>
 Zijun Hu <zijun.hu@oss.qualcomm.com> <zijuhu@codeaurora.org>
+Zijun Hu <zijun_hu@htc.com>