SDL: Fix web joystick vibration (again)

SDL Commits
1 
From 96c03dc66e89765d5f81123c2056706dd6f28ea7 Mon Sep 17 00:00:00 2001
From: Nintorch <[EMAIL REDACTED]>
Date: Mon, 1 Jun 2026 00:05:25 +0500
Subject: [PATCH] Fix web joystick vibration (again)

---
 src/joystick/emscripten/SDL_sysjoystick.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/joystick/emscripten/SDL_sysjoystick.c b/src/joystick/emscripten/SDL_sysjoystick.c
index 80ae01c46d36a..00a4c0bbba195 100644
--- a/src/joystick/emscripten/SDL_sysjoystick.c
+++ b/src/joystick/emscripten/SDL_sysjoystick.c
@@ -506,7 +506,7 @@ static bool EMSCRIPTEN_JoystickOpen(SDL_Joystick *joystick, int device_index)
 
     item->rumble_available = MAIN_THREAD_EM_ASM_INT({
         let gamepad = navigator['getGamepads']()[$0];
-        return gamepad && gamepad['vibrationActuator']; // Don't check the vibrationActuator.effects array here, because it's not defined in Safari
+        return gamepad && 'vibrationActuator' in gamepad; // Don't check the vibrationActuator.effects array here, because it's not defined in Safari
         }, item->index);
 
     if (item->rumble_available) {
@@ -516,7 +516,7 @@ static bool EMSCRIPTEN_JoystickOpen(SDL_Joystick *joystick, int device_index)
     item->trigger_rumble_available = MAIN_THREAD_EM_ASM_INT({
         let gamepad = navigator['getGamepads']()[$0];
         // This effect is not supported in Safari, so it's okay for us to check the vibrationActuator.effects array here for the browsers that do support it
-        return gamepad && gamepad['vibrationActuator'] && gamepad['vibrationActuator']['effects'] && gamepad['vibrationActuator']['effects']['includes']('trigger-rumble');
+        return gamepad && 'vibrationActuator' in gamepad && 'effects' in gamepad['vibrationActuator'] && gamepad['vibrationActuator']['effects']['includes']('trigger-rumble');
         }, item->index);
 
     if (item->trigger_rumble_available) {