Revert "video: Prefer Wayland over X11"

This reverts commit 8ceba27d62.

SDL Wayland support is stable, but there are a number of issues with third-party software (NVIDIA drivers, libwayland event overflow, libdecor not handling plugin load failures, Steam overlay not working with Wayland, etc.) that make it better to default to X11 at this time.

Games which would like to prefer wayland when available can use the following code before SDL_Init():
	SDL_SetHint(SDL_HINT_VIDEODRIVER, "wayland,x11");

Fixes https://github.com/libsdl-org/SDL/issues/5527

src/video/SDL_video.c

@@ -61,12 +61,12 @@ static VideoBootStrap *bootstrap[] = {
 #if SDL_VIDEO_DRIVER_COCOA
     &COCOA_bootstrap,
 #endif
-#if SDL_VIDEO_DRIVER_WAYLAND
-    &Wayland_bootstrap,
-#endif
 #if SDL_VIDEO_DRIVER_X11
     &X11_bootstrap,
 #endif
+#if SDL_VIDEO_DRIVER_WAYLAND
+    &Wayland_bootstrap,
+#endif
 #if SDL_VIDEO_DRIVER_VIVANTE
     &VIVANTE_bootstrap,
 #endif
@@ -4271,12 +4271,12 @@ SDL_IsScreenKeyboardShown(SDL_Window *window)
 #if SDL_VIDEO_DRIVER_UIKIT
 #include "uikit/SDL_uikitmessagebox.h"
 #endif
-#if SDL_VIDEO_DRIVER_WAYLAND
-#include "wayland/SDL_waylandmessagebox.h"
-#endif
 #if SDL_VIDEO_DRIVER_X11
 #include "x11/SDL_x11messagebox.h"
 #endif
+#if SDL_VIDEO_DRIVER_WAYLAND
+#include "wayland/SDL_waylandmessagebox.h"
+#endif
 #if SDL_VIDEO_DRIVER_HAIKU
 #include "haiku/SDL_bmessagebox.h"
 #endif
@@ -4384,13 +4384,6 @@ SDL_ShowMessageBox(const SDL_MessageBoxData *messageboxdata, int *buttonid)
         retval = 0;
     }
 #endif
-#if SDL_VIDEO_DRIVER_WAYLAND
-    if (retval == -1 &&
-        SDL_MessageboxValidForDriver(messageboxdata, SDL_SYSWM_WAYLAND) &&
-        Wayland_ShowMessageBox(messageboxdata, buttonid) == 0) {
-        retval = 0;
-    }
-#endif
 #if SDL_VIDEO_DRIVER_X11
     if (retval == -1 &&
         SDL_MessageboxValidForDriver(messageboxdata, SDL_SYSWM_X11) &&
@@ -4398,6 +4391,13 @@ SDL_ShowMessageBox(const SDL_MessageBoxData *messageboxdata, int *buttonid)
         retval = 0;
     }
 #endif
+#if SDL_VIDEO_DRIVER_WAYLAND
+    if (retval == -1 &&
+        SDL_MessageboxValidForDriver(messageboxdata, SDL_SYSWM_WAYLAND) &&
+        Wayland_ShowMessageBox(messageboxdata, buttonid) == 0) {
+        retval = 0;
+    }
+#endif
 #if SDL_VIDEO_DRIVER_HAIKU
     if (retval == -1 &&
         SDL_MessageboxValidForDriver(messageboxdata, SDL_SYSWM_HAIKU) &&