Move style inside template

Author: timeu

svg-piechart.html

@@ -28,13 +28,12 @@
 -->
 
 <dom-module id="svg-piechart">
-  <style>
-    :host {
-      display:block;
-    }
-   </style>
-
    <template>
+    <style>
+      :host {
+        display:block;
+      }
+    </style>
     <svg id="svg" width$="[[size]]" height$="[[size]]" viewBox="0 0 360 360"></svg>
   </template>