Change tests configuration using new 'common' plugin option (#734)

Author: stockiNail

test/fixtures/line/labelsScriptableOptions.js

@@ -16,8 +16,10 @@ module.exports = {
       },
       plugins: {
         annotation: {
-          drawTime() {
-            return 'afterDatasetsDraw';
+          common: {
+            drawTime() {
+              return 'afterDatasetsDraw';
+            }
           },
           annotations: {
             auto1: {

test/fixtures/line/scriptableOptions.js

@@ -16,8 +16,10 @@ module.exports = {
       },
       plugins: {
         annotation: {
-          drawTime() {
-            return 'afterDatasetsDraw';
+          common: {
+            drawTime() {
+              return 'afterDatasetsDraw';
+            }
           },
           annotations: {
             auto1: {

test/fixtures/polygon/hexagonWithPoints.js

@@ -18,7 +18,9 @@ module.exports = {
       plugins: {
         legend: false,
         annotation: {
-          drawTime: 'afterDraw',
+          common: {
+            drawTime: 'afterDraw'
+          },
           annotations: {
             octagon: {
               type: 'polygon',