applied legend li span styling to *-legend-icon only (references #366) (#369)

Author: davidfhaines

angular-chart.less

@@ -16,15 +16,15 @@
     padding: 2px 8px 2px 28px;
     font-size: smaller;
     cursor: default;
-
-    span {
-      display: block;
-      position: absolute;
-      left: 0;
-      top: 0;
-      width: 20px;
-      height: 20px;
-      border-radius: 5px;
-    }
   }
 }
+
+.chart-legend-icon, .bar-legend-icon, .line-legend-icon, .pie-legend-icon, .radar-legend-icon, .polararea-legend-icon, .doughnut-legend-icon {
+  display: block;
+  position: absolute;
+  left: 0;
+  top: 0;
+  width: 20px;
+  height: 20px;
+  border-radius: 5px;
+}