web: Rename RufflePlayer.on_callback_available to

RufflePlayer.onCallbackAvailable

web/packages/core/src/ruffle-player.ts

@@ -601,7 +601,7 @@ export class RufflePlayer extends HTMLElement {
      * @internal
      * @ignore
      */
-    on_callback_available(name: string): void {
+    onCallbackAvailable(name: string): void {
         const instance = this.instance;
         // eslint-disable-next-line @typescript-eslint/no-explicit-any
         (<any>this)[name] = (...args: any[]) => {

web/src/lib.rs

@@ -89,7 +89,7 @@ extern "C" {
     #[derive(Clone)]
     pub type JavascriptPlayer;
 
-    #[wasm_bindgen(method)]
+    #[wasm_bindgen(method, js_name = "onCallbackAvailable")]
     fn on_callback_available(this: &JavascriptPlayer, name: &str);
 
     #[wasm_bindgen(method)]