Add normalized names for Emscripten joysticks

[Nintorch]

• I confirm that I am the author of this code and release it to the SDL project under the Zlib license. This contribution does not contain code from other sources, including code generated by a Large Language Model ("AI").

Description

This PR normalizes the joystick names for the Emscripten joystick backend (i.e. removes the vendor/product IDs from the name, because they can be retrieved from the GUID). Here's a table that shows the current and new names:

	Chrome, current	Chrome, new	Firefox, current	Firefox, new
An unmapped controller	usb gamepad (Vendor: 0810 Product: e501)	usb gamepad	0810-e501-usb gamepad	usb gamepad
PS4 controller with 8BitDo adapter in XInput mode	Xbox 360 Wireless Controller	Xbox 360 Wireless Controller	Xbox 360 Wireless Controller	Xbox 360 Wireless Controller
PS4 controller	Wireless Controller (STANDARD GAMEPAD Vendor: 054c Product: 09c	Wireless Controller	054c-09cc-Wireless Controller	Wireless Controller
Xbox One controller	Xbox One S Controller	Xbox One S Controller	Xbox 360 Wireless Controller	Xbox 360 Wireless Controller
JoyCon Left	Wireless Gamepad (STANDARD GAMEPAD Vendor: 057e Product: 2006)	Wireless Gamepad	-	-
JoyCon Right	Wireless Gamepad (STANDARD GAMEPAD Vendor: 057e Product: 2007)	Wireless Gamepad	-	-
JoyCon Pair	Joy-Con L+R (STANDARD GAMEPAD Vendor: 057e Product: 200e)	Joy-Con L+R	-	-

Would this be a good idea?

Existing Issue(s)

None