Add toggle visibility to password (#938)

## What are the changes about?

I have add a keybinding to toggle the visibility of the password

## What existing issue does this resolve?

N/A

## Pre-requisites

- [x] I have tested & confirmed the changes work locally

Reviewed-on: https://codeberg.org/fairyglade/ly/pulls/938
Reviewed-by: AnErrupTion <anerruption+codeberg@disroot.org>
Co-authored-by: Luna <luna-39@noreply.codeberg.org>
Co-committed-by: Luna <luna-39@noreply.codeberg.org>

src/config/Config.zig

@@ -82,6 +82,7 @@ save: bool = true,
 service_name: [:0]const u8 = "ly",
 session_log: ?[]const u8 = "ly-session.log",
 setup_cmd: []const u8 = build_options.config_directory ++ "/ly/setup.sh",
+show_password_key: []const u8 = "F7",
 shutdown_cmd: []const u8 = "/sbin/shutdown -a now",
 shutdown_key: []const u8 = "F1",
 sleep_cmd: ?[]const u8 = null,

src/config/Lang.zig

@@ -78,6 +78,7 @@ restart: []const u8 = "reboot",
 shell: [:0]const u8 = "shell",
 shutdown: []const u8 = "shutdown",
 sleep: []const u8 = "sleep",
+toggle_password: []const u8 = "toggle password",
 wayland: []const u8 = "wayland",
 x11: []const u8 = "x11",
 xinitrc: [:0]const u8 = "xinitrc",