[gnome-shell-extensions] meson: Drop unused argument for i18n.merge_file()

[Marge Bot <marge-bot src gnome org>]

commit cdaa837d48894737ca0b4e7d2dfb365119e53759
Author: Jan Beich <jbeich FreeBSD org>
Date:   Tue Jan 25 11:49:54 2022 +0000

    meson: Drop unused argument for i18n.merge_file()
    
    Ignored in Meson < 0.60.0, deprecated since 0.60.1 and fatal since 0.61.0.
    
    data/meson.build:23:0: ERROR: Function does not take positional arguments.
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell-extensions/-/merge_requests/210>

 data/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/meson.build b/data/meson.build
index 47fe798..8154759 100644
--- a/data/meson.build
+++ b/data/meson.build
@@ -20,7 +20,7 @@ foreach name: session_desktops
         session_instdir = xsessiondir
         #session_instdir = [ xesssiondir, wlsessiondir ]
     endif
-    i18n.merge_file('',
+    i18n.merge_file(
       input:  session_desktop + '.in',
       output: session_desktop,
       po_dir: '../po',