Pre-web image changes refactor (#560)

* Pre-web image changes refactor

* Remove unneeded async behavior

src/lib/media/alt-text.ts

@@ -1,20 +1,12 @@
 import {RootStoreModel} from 'state/index'
+import {ImageModel} from 'state/models/media/image'
 
 export async function openAltTextModal(
   store: RootStoreModel,
-  prevAltText: string,
-): Promise<string> {
-  return new Promise((resolve, reject) => {
-    store.shell.openModal({
-      name: 'alt-text-image',
-      prevAltText,
-      onAltTextSet: (altText?: string) => {
-        if (altText) {
-          resolve(altText)
-        } else {
-          reject(new Error('Canceled'))
-        }
-      },
-    })
+  image: ImageModel,
+) {
+  store.shell.openModal({
+    name: 'alt-text-image',
+    image,
   })
 }