Update mixins to match Leaflet

Author: bytesnz

src/mixins/Circle.js

@@ -3,6 +3,11 @@ import Path from './Path';
 export default {
   mixins: [Path],
   props: {
+    fill: {
+      type: Boolean,
+      custom: true,
+      default: true
+    },
     radius: {
       type: Number,
       default: null

src/mixins/Path.js

@@ -52,7 +52,7 @@ export default {
     fill: {
       type: Boolean,
       custom: true,
-      default: true
+      default: false
     },
     fillColor: {
       type: String,

src/mixins/Polygon.js

@@ -2,6 +2,13 @@ import Polyline from './Polyline';
 
 export default {
   mixins: [Polyline],
+  props: {
+    fill: {
+      type: Boolean,
+      custom: true,
+      default: true
+    }
+  },
   mounted () {
     this.polygonOptions = this.polyLineOptions;
   },

src/mixins/Polyline.js

@@ -12,11 +12,6 @@ export default {
       type: Boolean,
       custom: true,
       default: false
-    },
-    fill: {
-      type: Boolean,
-      custom: true,
-      default: false
     }
   },
   data () {