Added setting to restore system default microphone after Talon grammar tests (#2631)

There is no way of telling if Talon currently is using the system
default microphone. Every time I run the Talon grammar tests this
setting changes and I have to manually reset it which is really
annoying.

## Checklist

- [/] I have added
[tests](https://www.cursorless.org/docs/contributing/test-case-recorder/)
- [/] I have updated the
[docs](https://github.com/cursorless-dev/cursorless/tree/main/docs) and
[cheatsheet](https://github.com/cursorless-dev/cursorless/tree/main/cursorless-talon/src/cheatsheet)
- [/] I have not broken the cheatsheet

---------

Co-authored-by: Phil Cohen <[email protected]>

Author: AndreasArvidsson

cursorless-talon-dev/src/spoken_form_test.py

@@ -1,7 +1,7 @@
 import json
 from typing import Any, Optional
 
-from talon import Context, Module, actions, scope
+from talon import Context, Module, actions, scope, settings
 
 mod = Module()
 
@@ -10,6 +10,12 @@
     "Used to run tests on the Cursorless spoken forms/grammar",
 )
 
+mod.setting(
+    "cursorless_spoken_form_test_restore_microphone",
+    str,
+    desc="The microphone to switch to after the spoken form tests are done. If unset, the microphone that was active before tests started is restored. (If you want to switch back to 'System Default', you should set that as the value here)",
+)
+
 ctx = Context()
 
 ctx.matches = r"""
@@ -72,7 +78,10 @@ def private_cursorless_spoken_form_test_mode(enable: bool):  # pyright: ignore [
 
         if enable:
             saved_modes = scope.get("mode")
-            saved_microphone = actions.sound.active_microphone()
+            saved_microphone = settings.get(
+                "user.cursorless_spoken_form_test_restore_microphone",
+                actions.sound.active_microphone(),
+            )
 
             disable_modes()
             actions.mode.enable("user.cursorless_spoken_form_test")