try to fix mm2 stop

Author: shamardy

mm2src/mm2_bin_lib/src/mm2_wasm_lib.rs

@@ -142,9 +142,13 @@ pub async fn mm2_main(params: JsValue, log_cb: js_sys::Function) -> Result<i8, J
         },
     };
 
+    // This allows context to be properly dropped when stop() is called
+    let ctx_weak = ctx.weak();
     executor::spawn_local(async move {
-        if let Err(e) = mm2_main::lp_run(ctx).await {
-            console_err!("MM2 runtime error: {}", e);
+        if let Some(ctx) = MmArc::from_weak(&ctx_weak) {
+            if let Err(e) = mm2_main::lp_run(ctx).await {
+                console_err!("MM2 runtime error: {}", e);
+            }
         }
         LP_MAIN_RUNNING.store(false, Ordering::Relaxed);
     });