desktop/xwayland: use index constants for atom array

This ensures we don't swap two atoms by mistake.

sway/desktop/xwayland.c

@@ -19,17 +19,17 @@
 #include "sway/tree/workspace.h"
 
 static const char *atom_map[ATOM_LAST] = {
-	"_NET_WM_WINDOW_TYPE_NORMAL",
-	"_NET_WM_WINDOW_TYPE_DIALOG",
-	"_NET_WM_WINDOW_TYPE_UTILITY",
-	"_NET_WM_WINDOW_TYPE_TOOLBAR",
-	"_NET_WM_WINDOW_TYPE_SPLASH",
-	"_NET_WM_WINDOW_TYPE_MENU",
-	"_NET_WM_WINDOW_TYPE_DROPDOWN_MENU",
-	"_NET_WM_WINDOW_TYPE_POPUP_MENU",
-	"_NET_WM_WINDOW_TYPE_TOOLTIP",
-	"_NET_WM_WINDOW_TYPE_NOTIFICATION",
-	"_NET_WM_STATE_MODAL",
+	[NET_WM_WINDOW_TYPE_NORMAL] = "_NET_WM_WINDOW_TYPE_NORMAL",
+	[NET_WM_WINDOW_TYPE_DIALOG] = "_NET_WM_WINDOW_TYPE_DIALOG",
+	[NET_WM_WINDOW_TYPE_UTILITY] = "_NET_WM_WINDOW_TYPE_UTILITY",
+	[NET_WM_WINDOW_TYPE_TOOLBAR] = "_NET_WM_WINDOW_TYPE_TOOLBAR",
+	[NET_WM_WINDOW_TYPE_SPLASH] = "_NET_WM_WINDOW_TYPE_SPLASH",
+	[NET_WM_WINDOW_TYPE_MENU] = "_NET_WM_WINDOW_TYPE_MENU",
+	[NET_WM_WINDOW_TYPE_DROPDOWN_MENU] = "_NET_WM_WINDOW_TYPE_DROPDOWN_MENU",
+	[NET_WM_WINDOW_TYPE_POPUP_MENU] = "_NET_WM_WINDOW_TYPE_POPUP_MENU",
+	[NET_WM_WINDOW_TYPE_TOOLTIP] = "_NET_WM_WINDOW_TYPE_TOOLTIP",
+	[NET_WM_WINDOW_TYPE_NOTIFICATION] = "_NET_WM_WINDOW_TYPE_NOTIFICATION",
+	[NET_WM_STATE_MODAL] = "_NET_WM_STATE_MODAL",
 };
 
 static void unmanaged_handle_request_configure(struct wl_listener *listener,