MAGETWO-91307: Clean up TypeScript errors after code restructuring

- fix banner and slider event name

Author: krissyhiserote

app/code/Magento/PageBuilder/view/adminhtml/web/js/content-type/banner/preview.js

@@ -87,7 +87,7 @@ export default class Preview extends BasePreview {
             events.trigger(`image:assigned:${this.parent.id}`, imageObject);
         });
 
-        events.on(`${this.config.name}:block:ready`, () => {
+        events.on(`${this.config.name}:contentType:ready`, () => {
             const dataStore = this.parent.dataStore.get();
             const initialImageValue = dataStore[this.config.additional_data.uploaderConfig.dataScope] || "";
 

app/code/Magento/PageBuilder/view/adminhtml/web/js/content-type/slide/preview.js

@@ -325,7 +325,7 @@ export default class Preview extends BasePreview {
             events.trigger(`image:assigned:${this.parent.id}`, imageObject);
         });
 
-        events.on(`${this.config.name}:block:ready`, () => {
+        events.on(`${this.config.name}:contentType:ready`, () => {
             const dataStore = this.parent.dataStore.get();
             const initialImageValue = dataStore[this.config.additional_data.uploaderConfig.dataScope] || "";