Update ZPOPMIN/ZPOPMAX command declaration

Unlike the BZPOP variants, these functions take a single key.  This fixes
an erroneous CROSSSLOT error when passing a count to a cluster enabled
server.

src/server.c

@@ -198,8 +198,8 @@ struct redisCommand redisCommandTable[] = {
     {"zrank",zrankCommand,3,"rF",0,NULL,1,1,1,0,0},
     {"zrevrank",zrevrankCommand,3,"rF",0,NULL,1,1,1,0,0},
     {"zscan",zscanCommand,-3,"rR",0,NULL,1,1,1,0,0},
-    {"zpopmin",zpopminCommand,-2,"wF",0,NULL,1,-1,1,0,0},
-    {"zpopmax",zpopmaxCommand,-2,"wF",0,NULL,1,-1,1,0,0},
+    {"zpopmin",zpopminCommand,-2,"wF",0,NULL,1,1,1,0,0},
+    {"zpopmax",zpopmaxCommand,-2,"wF",0,NULL,1,1,1,0,0},
     {"bzpopmin",bzpopminCommand,-2,"wsF",0,NULL,1,-2,1,0,0},
     {"bzpopmax",bzpopmaxCommand,-2,"wsF",0,NULL,1,-2,1,0,0},
     {"hset",hsetCommand,-4,"wmF",0,NULL,1,1,1,0,0},