fix(polyfill): report already-connected gamepads to the first listener

[triniwiz]

hookGamepadListeners started the gamepad backend before registering the caller's listener. The iOS, Android and Windows backends report controllers that are already connected synchronously when they start, so the first gamepadconnected listener never saw them. The listener is now registered first.

• packages/canvas-polyfill/gamepad.ts: register the listener, then start the backend.
• packages/canvas-polyfill/__test__/gamepad.test.mjs: regression test using a fake backend that reports a pad on start. It fails before the fix and passes after.
• Bumps @nativescript/canvas-polyfill to 3.0.0-alpha.19.

Testing

node --test packages/canvas-polyfill/__test__/gamepad.test.mjs packages/canvas-gamepad/__test__/common.test.mjs passes (8 tests).

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