firmware: add windows BLE hacks

This works around some issues that have been observed on a specific
Windows computer.

Issue: https://github.com/pybricks/support/issues/256

src/utils/os.test.ts

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: MIT
 // Copyright (c) 2021 The Pybricks Authors
 
-import { isMacOS, prefersDarkMode } from './os';
+import { isMacOS, isWindows, prefersDarkMode } from './os';
 
 describe('isMacOS', () => {
     test('is true', () => {
@@ -14,6 +14,17 @@ describe('isMacOS', () => {
     });
 });
 
+describe('isWindows', () => {
+    test('is true', () => {
+        jest.spyOn(navigator, 'platform', 'get').mockReturnValue('Win32');
+        expect(isWindows()).toBeTruthy();
+    });
+    test('is false', () => {
+        jest.spyOn(navigator, 'platform', 'get').mockReturnValue('MacIntel');
+        expect(isWindows()).toBeFalsy();
+    });
+});
+
 describe('prefersDarkMode', () => {
     test('is true', () => {
         window.matchMedia = jest.fn().mockReturnValue({

src/utils/os.ts

@@ -11,6 +11,14 @@ export function isMacOS(): boolean {
     return /mac/i.test(navigator.platform);
 }
 
+/**
+ * Tests if we are running on Windows.
+ * @returns `true` if running on Windows, otherwise `false`.
+ */
+export function isWindows(): boolean {
+    return /win/i.test(navigator.platform);
+}
+
 /**
  * Tests if the OS is set to dark mode.
  * @returns: `true` if dark mode should be preferred, otherwise `false`.