webUSB configure associated url

[apage224]

Currently, the webUSB url is set in webusb_controller.c

#define URL "ambiqai.github.io/web-ble-dashboards/ic_demo/"

// Microsoft OS 2.0 compatible descriptor
#define DESC_MS_OS_20 7
#define WEBUSB_REQUEST_SET_CONTROL_LINE_STATE 0x22
#define REWRIT_NUMBER 40 // allow for long blocks to be sent in parts

const tusb_desc_webusb_url_t desc_url = {
    .bLength = 3 + sizeof(URL) - 1,
    .bDescriptorType = 3, // WEBUSB URL type
    .bScheme = 1,         // 0: http, 1: https
    .url = URL};

It would be nice for me to override desc_url to specify a different URL (e.g. https://ambiqai.github.io/tileio/)