drop polyfill for chromimum < v85

This removes the polyfill for using older chrome browsers before the
writeWithResponse and writeWithoutResponse APIs were added.

src/components/notification-i18n.en.json

@@ -1,6 +1,5 @@
 {
     "ble": {
-        "cannotWriteWithoutResponse": "This web browser does not support Web Bluetooth Write Characteristic Without Response. Flashing firmware will take a long time.",
         "gattPermission": "The web browser did not give permission to use Bluetooth Low Energy",
         "gattServiceNotFound": "Connected to hub but failed to get {serviceName} service. Try removing the \"{hubName}\" device in your OS Bluetooth settings, then try again.",
         "noWebBluetooth": "This web browser does not support Web Bluetooth or it is not enabled.",

src/components/notification-i18n.ts

@@ -4,7 +4,6 @@
 // Notification translation keys.
 
 export enum MessageId {
-    BleCannotWriteWithoutResponse = 'ble.cannotWriteWithoutResponse',
     BleConnectFailed = 'ble.connectFailed',
     BleGattPermission = 'ble.gattPermission',
     BleGattServiceNotFound = 'ble.gattServiceNotFound',