Implementing xzoomreset.

Thanks mvdan@mvdan.cc for proposing this.

config.def.h

@@ -116,6 +116,7 @@ static Shortcut shortcuts[] = {
 	{ XK_ANY_MOD,           XK_Print,       printsel,       {.i =  0} },
 	{ MODKEY|ShiftMask,     XK_Prior,       xzoom,          {.i = +1} },
 	{ MODKEY|ShiftMask,     XK_Next,        xzoom,          {.i = -1} },
+	{ MODKEY|ShiftMask,     XK_Home,        xzoomreset,     {.i =  0}  },
 	{ ShiftMask,            XK_Insert,      selpaste,       {.i =  0} },
 	{ MODKEY|ShiftMask,     XK_Insert,      clippaste,      {.i =  0} },
 	{ MODKEY,               XK_Num_Lock,    numlock,        {.i =  0} },