map: fix drawing of clients

lib/map/clientlayer.js

@@ -30,9 +30,9 @@ define(["leaflet"],
 
         var ctx = canvas.getContext("2d")
 
-        var distance = 12
         var radius = 3
         var a = 1.2
+        var startDistance = 12
         var startAngle = Math.PI
 
         ctx.beginPath()
@@ -46,6 +46,7 @@ define(["leaflet"],
           p.x -= s.x
           p.y -= s.y
 
+          var distance = startDistance
           var angle = startAngle
 
           for (var i = 0; i < clients; i++) {