[test] Fix test_glfw_events_glfw3 (#22945)

This fixes a typo from #21538

Author: sbc100

test/test_browser.py

@@ -2854,7 +2854,7 @@ def test_glfw3(self, args):
 
   @parameterized({
     '': (['-sUSE_GLFW=2', '-DUSE_GLFW=2'],),
-    'glfw3': (['-sUSE_GLFW=2', '-DUSE_GLFW=2'],),
+    'glfw3': (['-sUSE_GLFW=3', '-DUSE_GLFW=3'],),
   })
   @requires_graphics_hardware
   def test_glfw_events(self, args):