samples: Bluetooth: PAWR: Fix Response Slot Delay Value is too Small

Previously, reponse slot value is 5* 1.25ms = 6.25ms , on nxp rw61x
platform, host got the periodic adv report v2 and after about 6ms,
send reponse data cmd,  it is too late , so always rpt the 0x46 too
late err code to host , in order to send the response , so make rsp
delay update to 10ms.

Signed-off-by: Alex Zhou <alex.zhou@nxp.com>