Update wm/pekwm to 0.1.13.

Upstream changes:

Release-0 1 13
Bugs fixed
User visible changes

    * #248 "PekWM support for setting NET_WM_WINDOW_OPACITY hint" (partially?) reported by wallex
    * #254 "Make 'smart' placing smarter: Skip maximized windows." reported by wallex and fixed by Claes N舖t駭
    * #260 "Tell NETWM panels about all the windows in a group" reported by augustl and fixed by Claes N舖t駭
    * #266 "numpad key doesn't work in cmd/run dialog" reported by barkat1407 and fixed by Claes N舖t駭
    * #270 "Panels are movable" reported by Markand and fixed by Claes N舖t駭
    * #272 "PekWM in Fedora repos" reported by german and fixed by Claes N舖t駭
    * #275 "run go to exit" reported by darkdog and fixed by Claes N舖t駭
    * #283 "allow dialog windows to appear over fullscreen app" reported by Dreamkey
    * #284 "Variable evaluation in variable value" reported by atler and fixed by Claes N舖t駭
    * #293 "GropingDrag Crash" reported by moebius and fixed by Claes N舖t駭
    * #295 "Last opened window and panel" reported by Thom1 and fixed by Andreas Schlick

(gls)