fix: slider & subheading schemas are incorrect (#1961)

Author: eljefe223

packages/fast-components-react-base/src/slider/slider.schema.ts

@@ -3,7 +3,8 @@ export default {
     title: "Slider",
     description: "A slider component's schema definition.",
     type: "object",
-    id: "slider",
+    id: "@microsoft/fast-components-react-base/slider",
+    formPluginId: "@microsoft/fast-components-react-base/slider",
     properties: {
         disabled: {
             title: "Disabled",

packages/fast-components-react-msft/src/slider/slider.schema.ts

@@ -3,7 +3,8 @@ export default {
     title: "Slider",
     description: "A slider component's schema definition.",
     type: "object",
-    id: "slider",
+    id: "@microsoft/fast-components-react-msft/slider",
+    formPluginId: "@microsoft/fast-components-react-msft/slider",
     properties: {
         disabled: {
             title: "Disabled",

packages/fast-components-react-msft/src/subheading/subheading.schema.ts

@@ -1,5 +1,5 @@
 export default {
-    $schema: "http://json.schema.org/schema#",
+    $schema: "http://json-schema.org/schema#",
     title: "Subheading",
     description: "A Subheading component's schema definition",
     type: "object",