ephyr: fix help output.

Merged Tamura Dai requested to merge (removed):master into master

"-mouse" require two commas before options for Xephyr.

On starting Xephyr like help output as follow, parse error occured.

$ Xephyr :1 -mouse evdev,,,device=/dev/input/event5
Pointer option key () of value ((null)) not assigned!

In the following comment, two commas before options on using "-mouse". "https://gitlab.freedesktop.org/xorg/xserver/-/blob/03b2125005b1c8d4eb62a4173a74458bbe72807b/hw/kdrive/src/kinput.c#L832"

Signed-off-by: Tamura Dai kirinode0@gmail.com

Request-For-Review: @keithp @alanc

Edited by Tamura Dai

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