Update submodule.

[bitbound]

Changes:

• Removed unnecessary call to SwitchDesktop when setting thread to input desktop.
• Renamed ClipboardTransfer to TextTransfer and reused it for sending virtual keyboard input.
  • There's no risk of API incompatibility here. The enum is the same number, and the data model didn't change, so outdated agents will still handle the message.
• Moved the showing of "file transfer complete" modal out of the RPC call, which was blocking subsequent SignalR messages (e.g. input).
• Changed the input processing thread from STA to MTA.
  • I could have sworn some of the APIs (clipboard or input) required STA, which is why I was explicitly using it.
  • I'm not sure if something changed, but it apparently needs to be MTA now in order for it to switch desktops.
• Changed the virtual keyboard hidden input from textarea to input.
  • I was previously doing some hacky things to determine if enter or backspace was being pressed on the virtual keyboard on mobile.
  • While building ControlR, I discovered that it would pick up on keydown event for only these two keys. All other keys have "unidentified" as the key in the event.
  • But having these two keys identified in keydown allowed me to do things in a much less hacky way.
  • It also allows pasting from the virtual keyboard and having it transfer.
• The virtual keyboard button is now a toggle. It will stay open while it's toggled on and can't be passively dismissed.
• Fixed an issue with a weird "Paste" button constantly popping up in Firefox.
  • This was because they locked down the clipboard API in a recent update.
  • In Firefox and Safari, it now requires transient user activation for the call to await clipboard.readText succeed.
  • But instead of returning the clipboard content immediately, it pops up the Paste button. If the user clicks it, then the function returns the text. If not, it throws.
  • This behavior can be detected by querying the state of clipboard-read permission.
  • If the call throws, that means it requires transient user activation, and there will never be an option for the user to allow background access.
  • In this case, we warn them about it once with a modal, write to the console with more info, and put a value in localStorage that lets us know not to prompt again.
• Added async/await to a bunch of SignalR calls that should have been that way to begin with.