add toggle-keyboard-shortcuts-inhibit to CLI/IPC (#1366)

* add toggle-keyboard-shortcuts-inhibit to CLI/IPC

missed it in ef8d5274b8
or https://github.com/YaLTeR/niri/pull/630
or 0584dd2f1e
or whatever

* Update niri-ipc/src/lib.rs

---------

Co-authored-by: Ivan Molodetskikh <yalterz@gmail.com>

niri-ipc/src/lib.rs

@@ -212,6 +212,8 @@ pub enum Action {
         #[cfg_attr(feature = "clap", arg(short = 'd', long, action = clap::ArgAction::Set, default_value_t = true))]
         write_to_disk: bool,
     },
+    /// Enable or disable the keyboard shortcuts inhibitor (if any) for the focused window.
+    ToggleKeyboardShortcutsInhibit {},
     /// Close a window.
     #[cfg_attr(feature = "clap", clap(about = "Close the focused window"))]
     CloseWindow {