Add runtime dependency x11-xserver-utils providing xset (smoe:add-runtime-dependency-for-xset)

[smoe]

I yet fail to understand where exactly xset is invoked but have no difficulty to accept that one wants the tools shipping with x11-xserver-utils:

/usr/bin/iceauth
/usr/bin/sessreg
/usr/bin/showrgb
/usr/bin/xcmsdb
/usr/bin/xgamma
/usr/bin/xhost
/usr/bin/xkeystone
/usr/bin/xmodmap
/usr/bin/xrandr
/usr/bin/xrdb
/usr/bin/xrefresh
/usr/bin/xset
/usr/bin/xsetmode
/usr/bin/xsetpointer
/usr/bin/xsetroot
/usr/bin/xstdcmap
/usr/bin/xvidtune

Addresses #3391.

Took the freedom to also harmonize the number of blanks at the start of the lines in d/control files.

[BsAtHome]

I yet fail to understand where exactly xset is invoked...

The xset program is invoked in axis (src/emc/usr_intf/axis/scripts/axis.py) and qtvcp (lib/python/qtvcp/qt_action.py).
It is used to disable key repeat while LCNC is running. Whether this is a good idea is a matter of opinion and I am not a friend of programs changing my xserver setting. Especially because it works unreliably when running over a remote connection.

...but have no difficulty to accept that one wants the tools shipping with x11-xserver-utils:

Then the better option is then to remove the invocation of xset completely and be done with it.