fix: Schedule and Details page was not loading (#1527)

The page relied on obscure behavior of setting "isLibrary" to disable image uploads even in a course context. This commit refactors to use an explicit enableImageUpload prop in TinyMceWidget.

src/generic/WysiwygEditor.jsx

@@ -59,7 +59,7 @@ export const WysiwygEditor = ({
       initializeEditor={() => ({})}
       learningContextId={courseId}
       images={{}}
-      isLibrary
+      enableImageUpload={false}
       onEditorChange={() => ({})}
     />
   );