[gnome-flashback] output-xrandr: fix init tile info guard

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 83f1fe3ced4fb18d6085fb641ea4633b825ae27e
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Tue Dec 29 17:37:20 2020 +0200

    output-xrandr: fix init tile info guard
    
    Monitor tile info is possible to fetch when RANDR version 15 is
    exposed by the X11 server. We had inverted the check meaning that
    only if older versions were advertised would we attempt to init
    the tile information. Fix this guard, thus fix monitor tiling on
    X11.
    
    Based on mutter commit:
    https://gitlab.gnome.org/GNOME/mutter/-/commit/4ecc80fd802584245

 backends/gf-output-xrandr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/backends/gf-output-xrandr.c b/backends/gf-output-xrandr.c
index d4a7094..56213ab 100644
--- a/backends/gf-output-xrandr.c
+++ b/backends/gf-output-xrandr.c
@@ -852,7 +852,7 @@ gf_output_xrandr_new (GfGpuXrandr   *gpu_xrandr,
       output_info->height_mm = xrandr_output->mm_height;
     }
 
-  if (!gf_monitor_manager_xrandr_has_randr15 (monitor_manager_xrandr))
+  if (gf_monitor_manager_xrandr_has_randr15 (monitor_manager_xrandr))
     output_info_init_tile_info (output_info, xdisplay, output_id);
 
   output_info_init_modes (output_info, gpu, xrandr_output);